Properties of the Number -123121

One Hundred Twenty-Three Thousand One Hundred Twenty-One

Basics

Value: -123122 → -123121 → -123120

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 123121

Divisors: 1, 123121

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11110000011110001

Octal: -360361

Duodecimal: -5B301

Hexadecimal: -1e0f1

Square: 15158780641

Square Root: 350.88602138016273

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

G.f.: ∏_k>=1 1/(1-x^k)^2·k-1. A253289

Primes with digital product = 12. A107697

Lexicographically earliest sequence of prime numbers whose partial products, starting from the second, are all Fermat pseudoprimes to base 2 (A001567). A374028

Lexicographically earliest strictly increasing sequence of prime numbers whose partial products, starting from the second, are all Fermat pseudoprimes to base 2 (A001567). A374029

Primes that can be generated by the concatenation in base 8, in ascending order, of two consecutive integers read in base 10. A287310

Indices of tetrahedral numbers that are Fermat pseudoprimes to base 2. A321866

To get a(n), replace 0's in the binary expansion of n with (-1) and interpret the result in base n. A360096

Primes which are the reverse concatenation of two consecutive odd numbers. A104332

Numbers k such that k^p-p is prime, where p is product of the digits of k. A178328

Numbers k such that k*(k+1) divides tribonacci(k) (A000073(k)). A299156