231188981597 has 4 divisors (see below), whose sum is σ = 264215978976. Its totient is φ = 198161984220.

The previous prime is 231188981591. The next prime is 231188981599. The reversal of 231188981597 is 795189881132.

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 not a de Polignac number, because 231188981597 - 2⁴ = 231188981581 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 (231188981591) 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, 16513498679 + ... + 16513498692.

It is an arithmetic number, because the mean of its divisors is an integer number (66053994744).

Almost surely, 2^231188981597 is an apocalyptic number.

It is an amenable number.

231188981597 is a deficient number, since it is larger than the sum of its proper divisors (33026997379).

231188981597 is an equidigital number, since it uses as much as digits as its factorization.

231188981597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33026997378.

The product of its digits is 8709120, while the sum is 62.

The spelling of 231188981597 in words is "two hundred thirty-one billion, one hundred eighty-eight million, nine hundred eighty-one thousand, five hundred ninety-seven".