231639238771 has 4 divisors (see below), whose sum is σ = 237288976344. Its totient is φ = 225989501200.

The previous prime is 231639238769. The next prime is 231639238823. The reversal of 231639238771 is 177832936132.

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

It is a cyclic number.

It is not a de Polignac number, because 231639238771 - 2¹ = 231639238769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231639238711) 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, 2824868725 + ... + 2824868806.

It is an arithmetic number, because the mean of its divisors is an integer number (59322244086).

Almost surely, 2^231639238771 is an apocalyptic number.

231639238771 is a deficient number, since it is larger than the sum of its proper divisors (5649737573).

231639238771 is an equidigital number, since it uses as much as digits as its factorization.

231639238771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5649737572.

The product of its digits is 2286144, while the sum is 52.

The spelling of 231639238771 in words is "two hundred thirty-one billion, six hundred thirty-nine million, two hundred thirty-eight thousand, seven hundred seventy-one".