13513881 has 4 divisors (see below), whose sum is σ = 18018512. Its totient is φ = 9009252.

The previous prime is 13513873. The next prime is 13513897. The reversal of 13513881 is 18831531.

13513881 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18831531 = 3 ⋅6277177.

It is not a de Polignac number, because 13513881 - 2³ = 13513873 is a prime.

It is a super-2 number, since 2×13513881² = 365249959364322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13513081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2252311 + ... + 2252316.

It is an arithmetic number, because the mean of its divisors is an integer number (4504628).

Almost surely, 2^13513881 is an apocalyptic number.

It is an amenable number.

13513881 is a deficient number, since it is larger than the sum of its proper divisors (4504631).

13513881 is an equidigital number, since it uses as much as digits as its factorization.

13513881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504630.

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

The square root of 13513881 is about 3676.1230936953. The cubic root of 13513881 is about 238.1917398920.

The spelling of 13513881 in words is "thirteen million, five hundred thirteen thousand, eight hundred eighty-one".