231561033 has 32 divisors (see below), whose sum is σ = 356493312. Its totient is φ = 132316800.

The previous prime is 231561013. The next prime is 231561101. The reversal of 231561033 is 330165132.

It is a happy number.

It is not a de Polignac number, because 231561033 - 2¹² = 231556937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231560994 and 231561012.

It is not an unprimeable number, because it can be changed into a prime (231561013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51741 + ... + 56037.

It is an arithmetic number, because the mean of its divisors is an integer number (11140416).

Almost surely, 2^231561033 is an apocalyptic number.

231561033 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

231561033 is a deficient number, since it is larger than the sum of its proper divisors (124932279).

231561033 is a wasteful number, since it uses less digits than its factorization.

231561033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 231561033 is about 15217.1295913520. The cubic root of 231561033 is about 614.0755785895.

The spelling of 231561033 in words is "two hundred thirty-one million, five hundred sixty-one thousand, thirty-three".