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Properties of the Number 7861

Seven Thousand Eight Hundred Sixty-One

Basics

Value: 7860 → 7861 → 7862

Parity: odd

Prime: No

Previous Prime: 7853

Next Prime: 7867

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 7 × 1123

Divisors: 1, 7, 1123, 7861

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1111010110101

Octal: 17265

Duodecimal: 4671

Hexadecimal: 1eb5

Square: 61795321

Square Root: 88.66228059327146

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

Number of partitions of n with nonnegative rank. A64174
Coordination sequence for (2,5,infinity) tiling of hyperbolic plane. A265068
Number of ordered triples (a, b, c) with gcd(a, b, c) = 1 and 1 <= {a, b, c} <= n. A71778
Numbers n such that p(5n) is prime, where p(n) is the number of partitions of n. A114166
List of codewords in binary lexicode with Hamming distance 5 written as decimal numbers. A75931
Fundamental discriminants of real quadratic number fields with class number 5. A94614
Sum of even-indexed primes. A77126
a(1) = 3, a(n) = least k such that concatenation of n copies of k with all previous concatenation gives a prime. A111473
a(n) = [xn*(n+1/2)] ∏k=1..n ∑m>=0 xk·m2. A320932
Number of compositions of n with weakly increasing first quotients. A342492