13531881 has 16 divisors (see below), whose sum is σ = 20841408. Its totient is φ = 7718400.

The previous prime is 13531873. The next prime is 13531883. The reversal of 13531881 is 18813531.

It is not a de Polignac number, because 13531881 - 2³ = 13531873 is a prime.

It is a super-2 number, since 2×13531881² = 366223606796322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13531883) 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, 11500 + ... + 12621.

It is an arithmetic number, because the mean of its divisors is an integer number (1302588).

Almost surely, 2^13531881 is an apocalyptic number.

13531881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13531881 is a deficient number, since it is larger than the sum of its proper divisors (7309527).

13531881 is a wasteful number, since it uses less digits than its factorization.

13531881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24152.

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

The square root of 13531881 is about 3678.5705104021. The cubic root of 13531881 is about 238.2974472297.

The spelling of 13531881 in words is "thirteen million, five hundred thirty-one thousand, eight hundred eighty-one".