312931421 has 4 divisors (see below), whose sum is σ = 341379744. Its totient is φ = 284483100.

The previous prime is 312931417. The next prime is 312931433. The reversal of 312931421 is 124139213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 312931421 - 2² = 312931417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312931441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14224145 + ... + 14224166.

It is an arithmetic number, because the mean of its divisors is an integer number (85344936).

Almost surely, 2^312931421 is an apocalyptic number.

It is an amenable number.

312931421 is a deficient number, since it is larger than the sum of its proper divisors (28448323).

312931421 is a wasteful number, since it uses less digits than its factorization.

312931421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28448322.

The product of its digits is 1296, while the sum is 26.

The square root of 312931421 is about 17689.8677496470. The cubic root of 312931421 is about 678.9165423556.

The spelling of 312931421 in words is "three hundred twelve million, nine hundred thirty-one thousand, four hundred twenty-one".