231201018 has 24 divisors (see below), whose sum is σ = 501215988. Its totient is φ = 77023872.

The previous prime is 231201011. The next prime is 231201023. The reversal of 231201018 is 810102132.

It can be written as a sum of positive squares in 2 ways, for example, as 227617569 + 3583449 = 15087^2 + 1893^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231201011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57696 + ... + 61572.

Almost surely, 2^231201018 is an apocalyptic number.

231201018 is an abundant number, since it is smaller than the sum of its proper divisors (270014970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231201018 is a wasteful number, since it uses less digits than its factorization.

231201018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7198 (or 7195 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 231201018 is about 15205.2957222147. The cubic root of 231201018 is about 613.7571728442.

The spelling of 231201018 in words is "two hundred thirty-one million, two hundred one thousand, eighteen".