11539881 has 8 divisors (see below), whose sum is σ = 17096160. Its totient is φ = 7693236.

The previous prime is 11539861. The next prime is 11539903. The reversal of 11539881 is 18893511.

It is not a de Polignac number, because 11539881 - 2⁶ = 11539817 is a prime.

It is a super-2 number, since 2×11539881² = 266337706988322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11539841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213675 + ... + 213728.

It is an arithmetic number, because the mean of its divisors is an integer number (2137020).

Almost surely, 2^11539881 is an apocalyptic number.

It is an amenable number.

11539881 is a deficient number, since it is larger than the sum of its proper divisors (5556279).

11539881 is an equidigital number, since it uses as much as digits as its factorization.

11539881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427412 (or 427406 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 11539881 is about 3397.0400350894. The cubic root of 11539881 is about 225.9784940509.

The spelling of 11539881 in words is "eleven million, five hundred thirty-nine thousand, eight hundred eighty-one".