231892321 has 6 divisors (see below), whose sum is σ = 244739922. Its totient is φ = 219687120.

The previous prime is 231892301. The next prime is 231892327. The reversal of 231892321 is 123298132.

231892321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 220195921 + 11696400 = 14839^2 + 3420^2 .

It is not a de Polignac number, because 231892321 - 2⁹ = 231891809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231892327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 320820 + ... + 321541.

It is an arithmetic number, because the mean of its divisors is an integer number (40789987).

Almost surely, 2^231892321 is an apocalyptic number.

It is an amenable number.

231892321 is a deficient number, since it is larger than the sum of its proper divisors (12847601).

231892321 is an equidigital number, since it uses as much as digits as its factorization.

231892321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642399 (or 642380 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 231892321 is about 15228.0110651391. The cubic root of 231892321 is about 614.3682860570.

The spelling of 231892321 in words is "two hundred thirty-one million, eight hundred ninety-two thousand, three hundred twenty-one".