231536121 has 32 divisors (see below), whose sum is σ = 325459968. Its totient is φ = 146266560.

The previous prime is 231536093. The next prime is 231536159. The reversal of 231536121 is 121635132.

It is not a de Polignac number, because 231536121 - 2²³ = 223147513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231536091 and 231536100.

It is not an unprimeable number, because it can be changed into a prime (231536191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1212136 + ... + 1212326.

It is an arithmetic number, because the mean of its divisors is an integer number (10170624).

Almost surely, 2^231536121 is an apocalyptic number.

It is an amenable number.

231536121 is a deficient number, since it is larger than the sum of its proper divisors (93923847).

231536121 is a wasteful number, since it uses less digits than its factorization.

231536121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461.

The product of its digits is 1080, while the sum is 24.

The square root of 231536121 is about 15216.3110181147. The cubic root of 231536121 is about 614.0535564625.

The spelling of 231536121 in words is "two hundred thirty-one million, five hundred thirty-six thousand, one hundred twenty-one".