Properties of the Number 2158

Two Thousand One Hundred Fifty-Eight

Basics

Value: 2157 → 2158 → 2159

Parity: even

Prime: No

Previous Prime: 2153

Next Prime: 2161

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 13 × 83

Divisors: 1, 2, 13, 26, 83, 166, 1079, 2158

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100001101110

Octal: 4156

Duodecimal: 12BA

Hexadecimal: 86e

Square: 4656964

Square Root: 46.45427859734774

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 unimodular 2 X 2 matrices having all terms in {0,1,...,n}. A210000

a(n) = ∑_d∣n (-1)^d-1*d². A321543

Triangle [1,1,1,0,0,0,...] δ [1,0,0,0,...] with Deléham δ defined in A084938. A147703

Number of primes less than 1000n. A38812

Pascal's "rhombus" (actually a triangle T(n,k), n >= 0, 0<=k<=2n) read by rows: each entry is sum of 3 terms above it in previous row and one term above it two rows back. A59317

Number of integer partitions of n such that the number of parts is equal to the number of distinct divisors of parts. A371130

Numerators of continued fraction convergents to sqrt(6). A41006

Row 3 of A007754. A58794

Union_{odd primes p, n >= 3} {T_p(n)}, where T_m(x) = x·T_m-1(x) - T_m-2(x), m >= 2, T₀(x) = 2, T₁(x) = x (dilated Chebyshev polynomials of the first kind). A299071

3x+1 sequence starting at 27. A8884