15313881 has 12 divisors (see below), whose sum is σ = 22444016. Its totient is φ = 9280920.

The previous prime is 15313877. The next prime is 15313927. The reversal of 15313881 is 18831351.

It is not a de Polignac number, because 15313881 - 2² = 15313877 is a prime.

It is a super-2 number, since 2×15313881² = 469029902564322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15313801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20731 + ... + 21456.

Almost surely, 2^15313881 is an apocalyptic number.

15313881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15313881 is a deficient number, since it is larger than the sum of its proper divisors (7130135).

15313881 is a wasteful number, since it uses less digits than its factorization.

15313881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42212 (or 42201 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 15313881 is about 3913.2954143535. The cubic root of 15313881 is about 248.3295620746.

The spelling of 15313881 in words is "fifteen million, three hundred thirteen thousand, eight hundred eighty-one".