Properties of the Number 2815

Two Thousand Eight Hundred Fifteen

Basics

Value: 2814 → 2815 → 2816

Parity: odd

Prime: No

Previous Prime: 2803

Next Prime: 2819

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 × 563

Divisors: 1, 5, 563, 2815

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101011111111

Octal: 5377

Duodecimal: 1767

Hexadecimal: aff

Square: 7924225

Square Root: 53.056573579529235

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 alternating compositions of n, including twins (x,x). A344604

Number of atoms in a decahedron with n shells. A4068

D-toothpick sequence of the third kind starting with a single toothpick. A220500

a(n) = 2·n² - 2·n + 3. A97080

The table of permutations of N, each row induced by the rotation (to the right) of the n-th node in the infinite binary "decimal" fraction tree. A65658

Triangle read by rows: T(n,0) = T(n,n) = 1 and for 0<k<n: T(n,k) = 2·T(n-1, k-1) + T(n-1,k). A119258

Composite and every divisor (except 1) contains the digit 5. A62672

Björner-Welker sequence: 2ⁿ*(n² + n + 2) - 1. A55580

Starts of runs of 3 consecutive positive negaFibonacci-Niven numbers (A331085). A331087

a(n) = ∑_{k=0..floor(n/2)} A026615(n-k,k). A26625