315787221 has 8 divisors (see below), whose sum is σ = 467832960. Its totient is φ = 210524796.

The previous prime is 315787211. The next prime is 315787231. The reversal of 315787221 is 122787513.

It is an interprime number because it is at equal distance from previous prime (315787211) and next prime (315787231).

It is not a de Polignac number, because 315787221 - 2¹⁰ = 315786197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315787211) 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, 5847885 + ... + 5847938.

It is an arithmetic number, because the mean of its divisors is an integer number (58479120).

Almost surely, 2^315787221 is an apocalyptic number.

It is an amenable number.

315787221 is a deficient number, since it is larger than the sum of its proper divisors (152045739).

315787221 is a wasteful number, since it uses less digits than its factorization.

315787221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11695832 (or 11695826 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 315787221 is about 17770.4029498489. The cubic root of 315787221 is about 680.9755468718.

The spelling of 315787221 in words is "three hundred fifteen million, seven hundred eighty-seven thousand, two hundred twenty-one".