231653979 has 16 divisors (see below), whose sum is σ = 354263040. Its totient is φ = 149453640.

The previous prime is 231653963. The next prime is 231653993. The reversal of 231653979 is 979356132.

It is not a de Polignac number, because 231653979 - 2⁴ = 231653963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231653579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137547 + ... + 139220.

It is an arithmetic number, because the mean of its divisors is an integer number (22141440).

Almost surely, 2^231653979 is an apocalyptic number.

231653979 is a deficient number, since it is larger than the sum of its proper divisors (122609061).

231653979 is a wasteful number, since it uses less digits than its factorization.

231653979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276807 (or 276801 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The square root of 231653979 is about 15220.1832774773. The cubic root of 231653979 is about 614.1577286145.

The spelling of 231653979 in words is "two hundred thirty-one million, six hundred fifty-three thousand, nine hundred seventy-nine".