231531454523121 has 4 divisors (see below), whose sum is σ = 308708606030832. Its totient is φ = 154354303015412.

The previous prime is 231531454523119. The next prime is 231531454523191. The reversal of 231531454523121 is 121325454135132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231531454523121 - 2¹ = 231531454523119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231531454523191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38588575753851 + ... + 38588575753856.

It is an arithmetic number, because the mean of its divisors is an integer number (77177151507708).

Almost surely, 2^{231531454523121} is an apocalyptic number.

It is an amenable number.

231531454523121 is a deficient number, since it is larger than the sum of its proper divisors (77177151507711).

231531454523121 is an equidigital number, since it uses as much as digits as its factorization.

231531454523121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77177151507710.

The product of its digits is 432000, while the sum is 42.

The spelling of 231531454523121 in words is "two hundred thirty-one trillion, five hundred thirty-one billion, four hundred fifty-four million, five hundred twenty-three thousand, one hundred twenty-one".