231119989 has 2 divisors, whose sum is σ = 231119990. Its totient is φ = 231119988.

The previous prime is 231119983. The next prime is 231120007. The reversal of 231119989 is 989911132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212197489 + 18922500 = 14567^2 + 4350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231119989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231119983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115559994 + 115559995.

It is an arithmetic number, because the mean of its divisors is an integer number (115559995).

Almost surely, 2^231119989 is an apocalyptic number.

It is an amenable number.

231119989 is a deficient number, since it is larger than the sum of its proper divisors (1).

231119989 is an equidigital number, since it uses as much as digits as its factorization.

231119989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 43.

The square root of 231119989 is about 15202.6309894044. The cubic root of 231119989 is about 613.6854633258.

The spelling of 231119989 in words is "two hundred thirty-one million, one hundred nineteen thousand, nine hundred eighty-nine".