312725391 has 16 divisors (see below), whose sum is σ = 459381888. Its totient is φ = 187652000.

The previous prime is 312725383. The next prime is 312725401. The reversal of 312725391 is 193527213.

It is a cyclic number.

It is not a de Polignac number, because 312725391 - 2³ = 312725383 is a prime.

It is a super-2 number, since 2×312725391² = 195594340352205762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312725341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43581 + ... + 50246.

It is an arithmetic number, because the mean of its divisors is an integer number (28711368).

Almost surely, 2^312725391 is an apocalyptic number.

312725391 is a deficient number, since it is larger than the sum of its proper divisors (146656497).

312725391 is a wasteful number, since it uses less digits than its factorization.

312725391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93942.

The product of its digits is 11340, while the sum is 33.

The square root of 312725391 is about 17684.0434007610. The cubic root of 312725391 is about 678.7675130211.

It can be divided in two parts, 31272 and 5391, that added together give a palindrome (36663).

The spelling of 312725391 in words is "three hundred twelve million, seven hundred twenty-five thousand, three hundred ninety-one".