231720959 has 4 divisors (see below), whose sum is σ = 232107120. Its totient is φ = 231334800.

The previous prime is 231720947. The next prime is 231720961. The reversal of 231720959 is 959027132.

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

It is a cyclic number.

It is not a de Polignac number, because 231720959 - 2²⁰ = 230672383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231720059) 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, 192179 + ... + 193380.

It is an arithmetic number, because the mean of its divisors is an integer number (58026780).

Almost surely, 2^231720959 is an apocalyptic number.

231720959 is a deficient number, since it is larger than the sum of its proper divisors (386161).

231720959 is an equidigital number, since it uses as much as digits as its factorization.

231720959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386160.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 231720959 is about 15222.3834861693. The cubic root of 231720959 is about 614.2169150510.

The spelling of 231720959 in words is "two hundred thirty-one million, seven hundred twenty thousand, nine hundred fifty-nine".