Properties of the Number 7645

Seven Thousand Six Hundred Forty-Five

Basics

Value: 7644 → 7645 → 7646

Parity: odd

Prime: No

Previous Prime: 7643

Next Prime: 7649

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 5 × 11 × 139

Divisors: 1, 5, 11, 55, 139, 695, 1529, 7645

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1110111011101

Octal: 16735

Duodecimal: 4511

Hexadecimal: 1ddd

Square: 58446025

Square Root: 87.43569065318808

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Triangle of central factorial numbers |t(2n,2n-2k)| read by rows. A8955

Triangle of Lehmer-Comtet numbers of the first kind. A8296

Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,3. A37576

Central factorial numbers: 2nd subdiagonal of A008955. A1820

T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011. A260767

Numbers whose binary representation traces a nonselfcrossing circuit in honeycomb lattice when its bits (from the least to the second most significant bit) are interpreted as directions to proceed at each vertex. (The most significant 1-bit is ignored). A255571

Triangle read by rows, Stirling cycle numbers of order 2, T(n, n) = 1, T(n, k) = 0 if k < 0 or k > n, otherwise T(n, k) = T(n-1, k-1) + (n-1)²*T(n-1, k), for 0 <= k <= n. A269944

Odd composite integers m such that A003501(m-J(m,21)) == 2 (mod m) and gcd(m,21)=1, where J(m,21) is the Jacobi symbol. A339130

Number of partitions of n into 4 or more distinct parts. A347549

Sums of 7 distinct powers of 3. A38469