231215018 has 16 divisors (see below), whose sum is σ = 350952576. Its totient is φ = 114235920.

The previous prime is 231214993. The next prime is 231215029. The reversal of 231215018 is 810512132.

It is a happy number.

231215018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 231214984 and 231215002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125363 + ... + 127193.

It is an arithmetic number, because the mean of its divisors is an integer number (21934536).

Almost surely, 2^231215018 is an apocalyptic number.

231215018 is a deficient number, since it is larger than the sum of its proper divisors (119737558).

231215018 is a wasteful number, since it uses less digits than its factorization.

231215018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2549.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 231215018 is about 15205.7560811687. The cubic root of 231215018 is about 613.7695609485.

The spelling of 231215018 in words is "two hundred thirty-one million, two hundred fifteen thousand, eighteen".