231981579 has 6 divisors (see below), whose sum is σ = 335084516. Its totient is φ = 154654380.

The previous prime is 231981577. The next prime is 231981619. The reversal of 231981579 is 975189132.

231981579 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231981579 - 2¹ = 231981577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231981571) 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, 12887857 + ... + 12887874.

Almost surely, 2^231981579 is an apocalyptic number.

231981579 is a deficient number, since it is larger than the sum of its proper divisors (103102937).

231981579 is a wasteful number, since it uses less digits than its factorization.

231981579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25775737 (or 25775734 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 231981579 is about 15230.9415007740. The cubic root of 231981579 is about 614.4471017331.

The spelling of 231981579 in words is "two hundred thirty-one million, nine hundred eighty-one thousand, five hundred seventy-nine".