8721081315 has 24 divisors (see below), whose sum is σ = 15174038880. Its totient is φ = 4633551744.

The previous prime is 8721081307. The next prime is 8721081323. The reversal of 8721081315 is 5131801278.

It is an interprime number because it is at equal distance from previous prime (8721081307) and next prime (8721081323).

It is not a de Polignac number, because 8721081315 - 2³ = 8721081307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8721081315.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356610 + ... + 380279.

It is an arithmetic number, because the mean of its divisors is an integer number (632251620).

Almost surely, 2^8721081315 is an apocalyptic number.

8721081315 is a deficient number, since it is larger than the sum of its proper divisors (6452957565).

8721081315 is a wasteful number, since it uses less digits than its factorization.

8721081315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737163 (or 737160 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 8721081315 is about 93386.7298656506. The cubic root of 8721081315 is about 2058.3700081576.

The spelling of 8721081315 in words is "eight billion, seven hundred twenty-one million, eighty-one thousand, three hundred fifteen".