13009881 has 16 divisors (see below), whose sum is σ = 18184320. Its totient is φ = 8257920.

The previous prime is 13009823. The next prime is 13009901. The reversal of 13009881 is 18890031.

13009881 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13009881 - 2⁶ = 13009817 is a prime.

It is a super-2 number, since 2×13009881² = 338514007268322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13009781) 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, 27991 + ... + 28451.

It is an arithmetic number, because the mean of its divisors is an integer number (1136520).

Almost surely, 2^13009881 is an apocalyptic number.

It is an amenable number.

13009881 is a deficient number, since it is larger than the sum of its proper divisors (5174439).

13009881 is a wasteful number, since it uses less digits than its factorization.

13009881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 13009881 is about 3606.9212633491. The cubic root of 13009881 is about 235.1930268595.

The spelling of 13009881 in words is "thirteen million, nine thousand, eight hundred eighty-one".