Properties of the Number 1345

One Thousand Three Hundred Forty-Five

Basics

Value: 1344 → 1345 → 1346

Parity: odd

Prime: No

Previous Prime: 1327

Next Prime: 1361

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 269

Divisors: 1, 5, 269, 1345

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101000001

Octal: 2501

Duodecimal: 941

Hexadecimal: 541

Square: 1809025

Square Root: 36.6742416417845

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

The "comma sequence": the lexicographically earliest sequence of positive numbers with the property that the sequence formed by the pairs of digits adjacent to the commas between the terms is the same as the sequence of successive differences between the terms. A121805

Fourth spoke of a hexagonal spiral. A56108

Numbers m such that the Bernoulli number B_2·m has denominator 66. A51229

Numbers k such that k, k+1 and k+2 are products of two primes. A56809

Numbers k such that k, k+1 and k+2 have the same number of divisors. A5238

Number of permutations σ such that σ⁵=Id; degree-n permutations of order dividing 5. A52501

Number of compositions (ordered partitions) of n into distinct odd parts. A32021

a(n) = n*(n²+3·n-1)/3. A84990

Numbers k such that k² has an odd number of digits and the middle digit is 9. A279429

Numbers m such that the factorizations of m..m+2 have the same number of primes (including multiplicities). A45939