55231881 has 8 divisors (see below), whose sum is σ = 73724064. Its totient is φ = 36780480.

The previous prime is 55231877. The next prime is 55231889. The reversal of 55231881 is 18813255.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55231881 - 2² = 55231877 is a prime.

It is a super-2 number, since 2×55231881² = 6101121357596322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55231889) 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, 6880 + ... + 12561.

It is an arithmetic number, because the mean of its divisors is an integer number (9215508).

Almost surely, 2^55231881 is an apocalyptic number.

It is an amenable number.

55231881 is a deficient number, since it is larger than the sum of its proper divisors (18492183).

55231881 is a wasteful number, since it uses less digits than its factorization.

55231881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20391.

The product of its digits is 9600, while the sum is 33.

The square root of 55231881 is about 7431.8154578811. The cubic root of 55231881 is about 380.8289406460.

The spelling of 55231881 in words is "fifty-five million, two hundred thirty-one thousand, eight hundred eighty-one".