Properties of the Number 1969

One Thousand Nine Hundred Sixty-Nine

Basics

Value: 1968 → 1969 → 1970

Parity: odd

Prime: No

Previous Prime: 1951

Next Prime: 1973

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 11 × 179

Divisors: 1, 11, 179, 1969

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11110110001

Octal: 3661

Duodecimal: 1181

Hexadecimal: 7b1

Square: 3876961

Square Root: 44.37341546466758

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 complete rulers with length n. A103295

Odd numbers not of form p + 2^k (de Polignac numbers). A6285

a(n) = least k >= 1 such that the remainder when 6^k is divided by k is n. A127816

Values of n such that L(10) and N(10) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A227448

Numbers k such that 7^k + 6^k-1 is prime. A96185

The number of degree sequences with degree sum 2n representable by a connected graph (with multiple edges allowed). A147878

Numbers where 9 outnumbers any other digit. A292449

Compound filter: a(n) = T(A000010(n), A046523(n)), where T(n,k) is sequence A000027 used as a pairing function. A286160

a(n) = first unlucky number removed at the n-th stage of Lucky sieve. A219178

Triangle, read by rows, such that T(n,k) = T(n-1,k-1) + [T²](n-2,k-1) with T(n,0) = T(n,n) = 1 for n>=0, k>=0. A113983