231531375894 has 32 divisors (see below), whose sum is σ = 569923388160. Its totient is φ = 61063219872.

The previous prime is 231531375841. The next prime is 231531375899. The reversal of 231531375894 is 498573135132.

It is a happy number.

231531375894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231531375899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212024524 + ... + 212025615.

It is an arithmetic number, because the mean of its divisors is an integer number (17810105880).

Almost surely, 2^231531375894 is an apocalyptic number.

231531375894 is an abundant number, since it is smaller than the sum of its proper divisors (338392012266).

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

231531375894 is a wasteful number, since it uses less digits than its factorization.

231531375894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424050164.

The product of its digits is 2721600, while the sum is 51.

The spelling of 231531375894 in words is "two hundred thirty-one billion, five hundred thirty-one million, three hundred seventy-five thousand, eight hundred ninety-four".