231551431340389 has 2 divisors, whose sum is σ = 231551431340390. Its totient is φ = 231551431340388.

The previous prime is 231551431340353. The next prime is 231551431340429. The reversal of 231551431340389 is 983043134155132.

231551431340389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231534416225025 + 17015115364 = 15216255^2 + 130442^2 .

It is a cyclic number.

It is not a de Polignac number, because 231551431340389 - 2³³ = 231542841405797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231551431340329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115775715670194 + 115775715670195.

It is an arithmetic number, because the mean of its divisors is an integer number (115775715670195).

Almost surely, 2^{231551431340389} is an apocalyptic number.

It is an amenable number.

231551431340389 is a deficient number, since it is larger than the sum of its proper divisors (1).

231551431340389 is an equidigital number, since it uses as much as digits as its factorization.

231551431340389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4665600, while the sum is 52.

The spelling of 231551431340389 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, four hundred thirty-one million, three hundred forty thousand, three hundred eighty-nine".