15315891 has 16 divisors (see below), whose sum is σ = 21654528. Its totient is φ = 9612000.

The previous prime is 15315889. The next prime is 15315913. The reversal of 15315891 is 19851351.

It is not a de Polignac number, because 15315891 - 2¹ = 15315889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15315841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1216 + ... + 5666.

It is an arithmetic number, because the mean of its divisors is an integer number (1353408).

Almost surely, 2^15315891 is an apocalyptic number.

15315891 is a deficient number, since it is larger than the sum of its proper divisors (6338637).

15315891 is a wasteful number, since it uses less digits than its factorization.

15315891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4522.

The product of its digits is 5400, while the sum is 33.

The square root of 15315891 is about 3913.5522227255. The cubic root of 15315891 is about 248.3404263047.

The spelling of 15315891 in words is "fifteen million, three hundred fifteen thousand, eight hundred ninety-one".