12931109 has 2 divisors, whose sum is σ = 12931110. Its totient is φ = 12931108.

The previous prime is 12931103. The next prime is 12931111. The reversal of 12931109 is 90113921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11710084 + 1221025 = 3422^2 + 1105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12931109 is a prime.

Together with 12931111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12931103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6465554 + 6465555.

It is an arithmetic number, because the mean of its divisors is an integer number (6465555).

Almost surely, 2^12931109 is an apocalyptic number.

It is an amenable number.

12931109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12931109 is an equidigital number, since it uses as much as digits as its factorization.

12931109 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 12931109 is about 3595.9851223274. The cubic root of 12931109 is about 234.7173847185.

The spelling of 12931109 in words is "twelve million, nine hundred thirty-one thousand, one hundred nine".