315971587 has 2 divisors, whose sum is σ = 315971588. Its totient is φ = 315971586.

The previous prime is 315971573. The next prime is 315971597. The reversal of 315971587 is 785179513.

It is a strong prime.

It is an emirp because it is prime and its reverse (785179513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315971587 is a prime.

It is not a weakly prime, because it can be changed into another prime (315971507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157985793 + 157985794.

It is an arithmetic number, because the mean of its divisors is an integer number (157985794).

Almost surely, 2^315971587 is an apocalyptic number.

315971587 is a deficient number, since it is larger than the sum of its proper divisors (1).

315971587 is an equidigital number, since it uses as much as digits as its factorization.

315971587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 264600, while the sum is 46.

The square root of 315971587 is about 17775.5896386027. The cubic root of 315971587 is about 681.1080457024.

The spelling of 315971587 in words is "three hundred fifteen million, nine hundred seventy-one thousand, five hundred eighty-seven".