231639589 has 4 divisors (see below), whose sum is σ = 234027724. Its totient is φ = 229251456.

The previous prime is 231639563. The next prime is 231639593. The reversal of 231639589 is 985936132.

It is a happy number.

231639589 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32970564 + 198669025 = 5742^2 + 14095^2 .

It is a cyclic number.

It is not a de Polignac number, because 231639589 - 2⁵ = 231639557 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 (231639539) 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, 1193922 + ... + 1194115.

It is an arithmetic number, because the mean of its divisors is an integer number (58506931).

Almost surely, 2^231639589 is an apocalyptic number.

It is an amenable number.

231639589 is a deficient number, since it is larger than the sum of its proper divisors (2388135).

231639589 is an equidigital number, since it uses as much as digits as its factorization.

231639589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388134.

The product of its digits is 349920, while the sum is 46.

The square root of 231639589 is about 15219.7105425826. The cubic root of 231639589 is about 614.1450114968.

It can be divided in two parts, 2316395 and 89, that added together give a square (2316484 = 1522²).

The spelling of 231639589 in words is "two hundred thirty-one million, six hundred thirty-nine thousand, five hundred eighty-nine".