231555215 has 16 divisors (see below), whose sum is σ = 301058208. Its totient is φ = 170290176.

The previous prime is 231555173. The next prime is 231555257. The reversal of 231555215 is 512555132.

231555215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231555173) and next prime (231555257).

It is a cyclic number.

It is not a de Polignac number, because 231555215 - 2¹⁸ = 231293071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28022 + ... + 35331.

It is an arithmetic number, because the mean of its divisors is an integer number (18816138).

Almost surely, 2^231555215 is an apocalyptic number.

231555215 is a deficient number, since it is larger than the sum of its proper divisors (69502993).

231555215 is a wasteful number, since it uses less digits than its factorization.

231555215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63418.

The product of its digits is 7500, while the sum is 29.

The square root of 231555215 is about 15216.9384240063. The cubic root of 231555215 is about 614.0704356378.

The spelling of 231555215 in words is "two hundred thirty-one million, five hundred fifty-five thousand, two hundred fifteen".