ℕ atory
Play Now

Properties of the Number 2155

Two Thousand One Hundred Fifty-Five

Basics

Value: 2154 → 2155 → 2156

Parity: odd

Prime: No

Previous Prime: 2153

Next Prime: 2161

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 431

Divisors: 1, 5, 431, 2155

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100001101011

Octal: 4153

Duodecimal: 12B7

Hexadecimal: 86b

Square: 4644025

Square Root: 46.42197755374064

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 balls in pyramid with base either a regular hexagon or a hexagon with alternate sides differing by 1 (balls in hexagonal pyramid of height n taken from hexagonal close-packing). A19298
Smallest number whose cube has n digits. A18005
L-toothpick sequence (see Comment lines for definition). A172310
a(n) = T(n, floor(n/2)), where T is given by A026584. A26595
Number of integer partitions y of n such that yi = yi+1 for all even i. A351003
a(n) = T(2·n-1, n-1), where T is given by A026584. A26593
a(n) = n*(13·n2 - 7)/6. A62025
Primitive numbers in A229304. A229308
Number of positive special sums of integer partitions of n. A301854
Inverse Euler transform of the sum-of-divisors or σ function A000203. A320780