231816861277 has 4 divisors (see below), whose sum is σ = 239294824576. Its totient is φ = 224338897980.

The previous prime is 231816861247. The next prime is 231816861281. The reversal of 231816861277 is 772168618132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231816861277 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 (231816861247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3738981603 + ... + 3738981664.

It is an arithmetic number, because the mean of its divisors is an integer number (59823706144).

Almost surely, 2^231816861277 is an apocalyptic number.

It is an amenable number.

231816861277 is a deficient number, since it is larger than the sum of its proper divisors (7477963299).

231816861277 is an equidigital number, since it uses as much as digits as its factorization.

231816861277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7477963298.

The product of its digits is 1354752, while the sum is 52.

The spelling of 231816861277 in words is "two hundred thirty-one billion, eight hundred sixteen million, eight hundred sixty-one thousand, two hundred seventy-seven".