315742621 has 2 divisors, whose sum is σ = 315742622. Its totient is φ = 315742620.

The previous prime is 315742613. The next prime is 315742631. The reversal of 315742621 is 126247513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301196025 + 14546596 = 17355^2 + 3814^2 .

It is a cyclic number.

It is not a de Polignac number, because 315742621 - 2³ = 315742613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315742631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157871310 + 157871311.

It is an arithmetic number, because the mean of its divisors is an integer number (157871311).

Almost surely, 2^315742621 is an apocalyptic number.

It is an amenable number.

315742621 is a deficient number, since it is larger than the sum of its proper divisors (1).

315742621 is an equidigital number, since it uses as much as digits as its factorization.

315742621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 315742621 is about 17769.1480099638. The cubic root of 315742621 is about 680.9434863182.

The spelling of 315742621 in words is "three hundred fifteen million, seven hundred forty-two thousand, six hundred twenty-one".