231561233 has 8 divisors (see below), whose sum is σ = 247056480. Its totient is φ = 216274240.

The previous prime is 231561229. The next prime is 231561241. The reversal of 231561233 is 332165132.

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

It is a cyclic number.

It is not a de Polignac number, because 231561233 - 2² = 231561229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231561203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49763 + ... + 54216.

It is an arithmetic number, because the mean of its divisors is an integer number (30882060).

Almost surely, 2^231561233 is an apocalyptic number.

It is an amenable number.

231561233 is a deficient number, since it is larger than the sum of its proper divisors (15495247).

231561233 is a wasteful number, since it uses less digits than its factorization.

231561233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104127.

The product of its digits is 3240, while the sum is 26.

The square root of 231561233 is about 15217.1361628921. The cubic root of 231561233 is about 614.0757553825.

It can be divided in two parts, 23156 and 1233, that added together give a cube (24389 = 29³).

The spelling of 231561233 in words is "two hundred thirty-one million, five hundred sixty-one thousand, two hundred thirty-three".