231123989 has 2 divisors, whose sum is σ = 231123990. Its totient is φ = 231123988.

The previous prime is 231123983. The next prime is 231124007. The reversal of 231123989 is 989321132.

231123989 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., 226954225 + 4169764 = 15065^2 + 2042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231123989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231123983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115561994 + 115561995.

It is an arithmetic number, because the mean of its divisors is an integer number (115561995).

Almost surely, 2^231123989 is an apocalyptic number.

It is an amenable number.

231123989 is a deficient number, since it is larger than the sum of its proper divisors (1).

231123989 is an equidigital number, since it uses as much as digits as its factorization.

231123989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 231123989 is about 15202.7625450114. The cubic root of 231123989 is about 613.6890036625.

The spelling of 231123989 in words is "two hundred thirty-one million, one hundred twenty-three thousand, nine hundred eighty-nine".