231580865 has 4 divisors (see below), whose sum is σ = 277897044. Its totient is φ = 185264688.

The previous prime is 231580861. The next prime is 231580889. The reversal of 231580865 is 568085132.

231580865 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 175615504 + 55965361 = 13252^2 + 7481^2 .

It is a cyclic number.

It is not a de Polignac number, because 231580865 - 2² = 231580861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231580861) 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, 23158082 + ... + 23158091.

It is an arithmetic number, because the mean of its divisors is an integer number (69474261).

Almost surely, 2^231580865 is an apocalyptic number.

It is an amenable number.

231580865 is a deficient number, since it is larger than the sum of its proper divisors (46316179).

231580865 is an equidigital number, since it uses as much as digits as its factorization.

231580865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46316178.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 231580865 is about 15217.7812114644. The cubic root of 231580865 is about 614.0931088839.

The spelling of 231580865 in words is "two hundred thirty-one million, five hundred eighty thousand, eight hundred sixty-five".