231551431354321 has 4 divisors (see below), whose sum is σ = 249363079920052. Its totient is φ = 213739782788592.

The previous prime is 231551431354297. The next prime is 231551431354367. The reversal of 231551431354321 is 123453134155132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 77758693611921 + 153792737742400 = 8818089^2 + 12401320^2 .

It is a cyclic number.

It is not a de Polignac number, because 231551431354321 - 2¹¹ = 231551431352273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231551431304321) 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, 8905824282846 + ... + 8905824282871.

It is an arithmetic number, because the mean of its divisors is an integer number (62340769980013).

Almost surely, 2^{231551431354321} is an apocalyptic number.

It is an amenable number.

231551431354321 is a deficient number, since it is larger than the sum of its proper divisors (17811648565731).

231551431354321 is a wasteful number, since it uses less digits than its factorization.

231551431354321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17811648565730.

The product of its digits is 648000, while the sum is 43.

The spelling of 231551431354321 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 twenty-one".