231162989 has 2 divisors, whose sum is σ = 231162990. Its totient is φ = 231162988.

The previous prime is 231162983. The next prime is 231163033. The reversal of 231162989 is 989261132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214622500 + 16540489 = 14650^2 + 4067^2 .

It is a cyclic number.

It is not a de Polignac number, because 231162989 - 2²⁰ = 230114413 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231162983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115581494 + 115581495.

It is an arithmetic number, because the mean of its divisors is an integer number (115581495).

Almost surely, 2^231162989 is an apocalyptic number.

It is an amenable number.

231162989 is a deficient number, since it is larger than the sum of its proper divisors (1).

231162989 is an equidigital number, since it uses as much as digits as its factorization.

231162989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 231162989 is about 15204.0451525244. The cubic root of 231162989 is about 613.7235198042.

The spelling of 231162989 in words is "two hundred thirty-one million, one hundred sixty-two thousand, nine hundred eighty-nine".