231531501133233 has 12 divisors (see below), whose sum is σ = 382210732029568. Its totient is φ = 132303714933240.

The previous prime is 231531501133187. The next prime is 231531501133241. The reversal of 231531501133233 is 332331105135132.

231531501133233 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 315 + 0 + 1 + 1 + 332 + 3 + 3 = 666.

It is not a de Polignac number, because 231531501133233 - 2²¹ = 231531499036081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231531501133133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1837551596233 + ... + 1837551596358.

Almost surely, 2^{231531501133233} is an apocalyptic number.

It is an amenable number.

231531501133233 is a deficient number, since it is larger than the sum of its proper divisors (150679230896335).

231531501133233 is a wasteful number, since it uses less digits than its factorization.

231531501133233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675103192604 (or 3675103192601 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 36.

Adding to 231531501133233 its reverse (332331105135132), we get a palindrome (563862606268365).

The spelling of 231531501133233 in words is "two hundred thirty-one trillion, five hundred thirty-one billion, five hundred one million, one hundred thirty-three thousand, two hundred thirty-three".