231261018 has 16 divisors (see below), whose sum is σ = 462753120. Its totient is φ = 77048496.

The previous prime is 231260983. The next prime is 231261073. The reversal of 231261018 is 810162132.

231261018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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, 5121 + ... + 22107.

It is an arithmetic number, because the mean of its divisors is an integer number (28922070).

Almost surely, 2^231261018 is an apocalyptic number.

231261018 is an abundant number, since it is smaller than the sum of its proper divisors (231492102).

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

231261018 is a wasteful number, since it uses less digits than its factorization.

231261018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19261.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 231261018 is about 15207.2685910390. The cubic root of 231261018 is about 613.8102611994.

The spelling of 231261018 in words is "two hundred thirty-one million, two hundred sixty-one thousand, eighteen".