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Properties of the Number 6491

Six Thousand Four Hundred Ninety-One

Basics

Value: 6490 → 6491 → 6492

Parity: odd

Prime: Yes

Previous Prime: 6481

Next Prime: 6521

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 6491

Divisors: 1, 6491

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1100101011011

Octal: 14533

Duodecimal: 390B

Hexadecimal: 195b

Square: 42133081

Square Root: 80.56674251823763

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

Artiads: the primes p == 1 (mod 5) for which Fibonacci((p-1)/5) is divisible by p. A1583
Primes of the form k2 + k + 11. A48059
Primes p whose period of reciprocal equals (p-1)/5. A56210
Number of distinct means of nonempty subsets of {1,...,n}. A135342
a(n) = a(n-1) + a(m) for n >= 4, where m = 2·n - 3 - 2p+1 and p is the unique integer such that 2p < n - 1 <= 2p+1, starting with a(1) = 1, a(2) = 2, and a(3) = 4. A50052
Primes that can be written as the sum of 13 consecutive primes. A127341
a(n) = a(n-1) + a(m) for n >= 4, where m = 2·n - 3 - 2p+1 and 2p < n - 1 <= 2p+1, starting with a(1) = a(2) = 1 and a(3) = 4. A50036
a(n) = a(n-1) + a(m) for n >= 3, where m = 2·n - 3 - 2p+1 and p is the unique integer such that 2p < n - 1 <= 2p+1, starting with a(1) = 1 and a(2) = 3. A50068
Numbers n such that A003313(n) = A003313(2n). A86878
Primes p such that q-p = 30, where q is the next prime after p. A124596