12931409 has 2 divisors, whose sum is σ = 12931410. Its totient is φ = 12931408.

The previous prime is 12931393. The next prime is 12931411. The reversal of 12931409 is 90413921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12759184 + 172225 = 3572^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 12931409 - 2⁴ = 12931393 is a prime.

Together with 12931411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12931459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6465704 + 6465705.

It is an arithmetic number, because the mean of its divisors is an integer number (6465705).

Almost surely, 2^12931409 is an apocalyptic number.

It is an amenable number.

12931409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12931409 is an equidigital number, since it uses as much as digits as its factorization.

12931409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 12931409 is about 3596.0268352725. The cubic root of 12931409 is about 234.7191998418.

The spelling of 12931409 in words is "twelve million, nine hundred thirty-one thousand, four hundred nine".