231169889 has 2 divisors, whose sum is σ = 231169890. Its totient is φ = 231169888.

The previous prime is 231169877. The next prime is 231169891. The reversal of 231169889 is 988961132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201412864 + 29757025 = 14192^2 + 5455^2 .

It is a cyclic number.

It is not a de Polignac number, because 231169889 - 2⁸ = 231169633 is a prime.

Together with 231169891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231160889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115584944 + 115584945.

It is an arithmetic number, because the mean of its divisors is an integer number (115584945).

Almost surely, 2^231169889 is an apocalyptic number.

It is an amenable number.

231169889 is a deficient number, since it is larger than the sum of its proper divisors (1).

231169889 is an equidigital number, since it uses as much as digits as its factorization.

231169889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 47.

The square root of 231169889 is about 15204.2720641272. The cubic root of 231169889 is about 613.7296261020.

The spelling of 231169889 in words is "two hundred thirty-one million, one hundred sixty-nine thousand, eight hundred eighty-nine".