231552881 has 6 divisors (see below), whose sum is σ = 269357490. Its totient is φ = 198473856.

The previous prime is 231552859. The next prime is 231552931. The reversal of 231552881 is 188255132.

It can be written as a sum of positive squares in only one way, i.e., 135512881 + 96040000 = 11641^2 + 9800^2 .

It is not a de Polignac number, because 231552881 - 2⁶ = 231552817 is a prime.

It is a super-2 number, since 2×231552881² = 107233473398800322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231552851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2362736 + ... + 2362833.

It is an arithmetic number, because the mean of its divisors is an integer number (44892915).

Almost surely, 2^231552881 is an apocalyptic number.

It is an amenable number.

231552881 is a deficient number, since it is larger than the sum of its proper divisors (37804609).

231552881 is an equidigital number, since it uses as much as digits as its factorization.

231552881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4725583 (or 4725576 counting only the distinct ones).

The product of its digits is 19200, while the sum is 35.

The square root of 231552881 is about 15216.8617329593. The cubic root of 231552881 is about 614.0683724219.

The spelling of 231552881 in words is "two hundred thirty-one million, five hundred fifty-two thousand, eight hundred eighty-one".