312981621 has 8 divisors (see below), whose sum is σ = 417795840. Its totient is φ = 208410912.

The previous prime is 312981593. The next prime is 312981653. The reversal of 312981621 is 126189213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-312981621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312981121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57856 + ... + 63033.

It is an arithmetic number, because the mean of its divisors is an integer number (52224480).

Almost surely, 2^312981621 is an apocalyptic number.

It is an amenable number.

312981621 is a deficient number, since it is larger than the sum of its proper divisors (104814219).

312981621 is a wasteful number, since it uses less digits than its factorization.

312981621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121755.

The product of its digits is 5184, while the sum is 33.

The square root of 312981621 is about 17691.2865840786. The cubic root of 312981621 is about 678.9528440135.

The spelling of 312981621 in words is "three hundred twelve million, nine hundred eighty-one thousand, six hundred twenty-one".