12931091 has 2 divisors, whose sum is σ = 12931092. Its totient is φ = 12931090.

The previous prime is 12931081. The next prime is 12931103. The reversal of 12931091 is 19013921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12931091 - 2¹⁰ = 12930067 is a prime.

It is a super-2 number, since 2×12931091² = 334426228900562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12931091.

It is not a weakly prime, because it can be changed into another prime (12931081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6465545 + 6465546.

It is an arithmetic number, because the mean of its divisors is an integer number (6465546).

Almost surely, 2^12931091 is an apocalyptic number.

12931091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12931091 is an equidigital number, since it uses as much as digits as its factorization.

12931091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 12931091 is about 3595.9826195353. The cubic root of 12931091 is about 234.7172758102.

The spelling of 12931091 in words is "twelve million, nine hundred thirty-one thousand, ninety-one".