312619621 has 2 divisors, whose sum is σ = 312619622. Its totient is φ = 312619620.

The previous prime is 312619609. The next prime is 312619627. The reversal of 312619621 is 126916213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250430625 + 62188996 = 15825^2 + 7886^2 .

It is a cyclic number.

It is not a de Polignac number, because 312619621 - 2²¹ = 310522469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312619627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156309810 + 156309811.

It is an arithmetic number, because the mean of its divisors is an integer number (156309811).

Almost surely, 2^312619621 is an apocalyptic number.

It is an amenable number.

312619621 is a deficient number, since it is larger than the sum of its proper divisors (1).

312619621 is an equidigital number, since it uses as much as digits as its factorization.

312619621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 312619621 is about 17681.0525987567. The cubic root of 312619621 is about 678.6909801295.

The spelling of 312619621 in words is "three hundred twelve million, six hundred nineteen thousand, six hundred twenty-one".