231727981087 has 4 divisors (see below), whose sum is σ = 245359038816. Its totient is φ = 218096923360.

The previous prime is 231727981039. The next prime is 231727981117. The reversal of 231727981087 is 780189727132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231727981087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231727181087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6815528839 + ... + 6815528872.

It is an arithmetic number, because the mean of its divisors is an integer number (61339759704).

Almost surely, 2^231727981087 is an apocalyptic number.

231727981087 is a deficient number, since it is larger than the sum of its proper divisors (13631057729).

231727981087 is a wasteful number, since it uses less digits than its factorization.

231727981087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13631057728.

The product of its (nonzero) digits is 2370816, while the sum is 55.

The spelling of 231727981087 in words is "two hundred thirty-one billion, seven hundred twenty-seven million, nine hundred eighty-one thousand, eighty-seven".