231256636 has 24 divisors (see below), whose sum is σ = 443222640. Its totient is φ = 104923392.

The previous prime is 231256631. The next prime is 231256637. The reversal of 231256636 is 636652132.

231256636 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 (231256631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34621 + ... + 40756.

It is an arithmetic number, because the mean of its divisors is an integer number (18467610).

Almost surely, 2^231256636 is an apocalyptic number.

231256636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

231256636 is a deficient number, since it is larger than the sum of its proper divisors (211966004).

231256636 is a wasteful number, since it uses less digits than its factorization.

231256636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75453 (or 75451 counting only the distinct ones).

The product of its digits is 38880, while the sum is 34.

The square root of 231256636 is about 15207.1245145162. The cubic root of 231256636 is about 613.8063842907.

The spelling of 231256636 in words is "two hundred thirty-one million, two hundred fifty-six thousand, six hundred thirty-six".