391131312 has 80 divisors (see below), whose sum is σ = 1187090688. Its totient is φ = 109405440.

The previous prime is 391131281. The next prime is 391131317. The reversal of 391131312 is 213131193.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (391131317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21628 + ... + 35355.

Almost surely, 2^391131312 is an apocalyptic number.

It is an amenable number.

391131312 is an abundant number, since it is smaller than the sum of its proper divisors (795959376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391131312 is a wasteful number, since it uses less digits than its factorization.

391131312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57018 (or 57012 counting only the distinct ones).

The product of its digits is 486, while the sum is 24.

The square root of 391131312 is about 19777.0400211963. The cubic root of 391131312 is about 731.3201307857.

The spelling of 391131312 in words is "three hundred ninety-one million, one hundred thirty-one thousand, three hundred twelve".