231551431354391 has 4 divisors (see below), whose sum is σ = 231558042044952. Its totient is φ = 231544820663832.

The previous prime is 231551431354379. The next prime is 231551431354409. The reversal of 231551431354391 is 193453134155132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231551431354391 - 2³⁸ = 231276553447447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231551431654391) 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, 3305292740 + ... + 3305362793.

It is an arithmetic number, because the mean of its divisors is an integer number (57889510511238).

Almost surely, 2^{231551431354391} is an apocalyptic number.

231551431354391 is a deficient number, since it is larger than the sum of its proper divisors (6610690561).

231551431354391 is an equidigital number, since it uses as much as digits as its factorization.

231551431354391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6610690560.

The product of its digits is 2916000, while the sum is 50.

The spelling of 231551431354391 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, four hundred thirty-one million, three hundred fifty-four thousand, three hundred ninety-one".