Properties of the Number 2156

Two Thousand One Hundred Fifty-Six

Basics

Value: 2155 → 2156 → 2157

Parity: even

Prime: No

Previous Prime: 2153

Next Prime: 2161

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 7 ² × 11

Divisors: 1, 2, 4, 7, 11, 14, 22, 28, 44, 49

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100001101100

Octal: 4154

Duodecimal: 12B8

Hexadecimal: 86c

Square: 4648336

Square Root: 46.4327470649756

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

a(n) = n*(n+5). A28557

Number of log-concave compositions (ordered partitions) of n. A69916

Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (9,n)-rectangular grid with k '1's and (9n-k) '0's: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other. A228168

Products of exactly 2 distinct squares of primes and a different prime (p² * q² * r). A179643

Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 4 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=n-n%2, read by rows. A238189

Expansion of 1/((1-x)²*(1-x²)*(1-x⁴)). A8804

Number of intersecting multiset partitions of weight n whose dual is not an intersecting multiset partition. A319779

Number of (w,x,y) with all terms in {0,...,n} and |w-x| < |x-y| < |y-w|. A212964

Heinz numbers of integer partitions with the same length as reverse-alternating sum. A357485

Starting from generation 8 add previous and next term yielding generation 9. A48455