931397309 has 16 divisors (see below), whose sum is σ = 1039754880. Its totient is φ = 829140480.

The previous prime is 931397231. The next prime is 931397359. The reversal of 931397309 is 903793139.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 931397309 - 2²⁸ = 662961853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 931397309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (931397359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238049 + ... + 241929.

It is an arithmetic number, because the mean of its divisors is an integer number (64984680).

Almost surely, 2^931397309 is an apocalyptic number.

It is an amenable number.

931397309 is a deficient number, since it is larger than the sum of its proper divisors (108357571).

931397309 is a wasteful number, since it uses less digits than its factorization.

931397309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4660.

The product of its (nonzero) digits is 137781, while the sum is 44.

The square root of 931397309 is about 30518.8025485929. The cubic root of 931397309 is about 976.5886208620.

The spelling of 931397309 in words is "nine hundred thirty-one million, three hundred ninety-seven thousand, three hundred nine".