231779979 has 6 divisors (see below), whose sum is σ = 334793316. Its totient is φ = 154519980.

The previous prime is 231779927. The next prime is 231779981. The reversal of 231779979 is 979977132.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-231779979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231779179) 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, 12876657 + ... + 12876674.

It is an arithmetic number, because the mean of its divisors is an integer number (55798886).

Almost surely, 2^231779979 is an apocalyptic number.

231779979 is a deficient number, since it is larger than the sum of its proper divisors (103013337).

231779979 is a wasteful number, since it uses less digits than its factorization.

231779979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25753337 (or 25753334 counting only the distinct ones).

The product of its digits is 1500282, while the sum is 54.

The square root of 231779979 is about 15224.3219553450. The cubic root of 231779979 is about 614.2690582339.

The spelling of 231779979 in words is "two hundred thirty-one million, seven hundred seventy-nine thousand, nine hundred seventy-nine".