231101989 has 2 divisors, whose sum is σ = 231101990. Its totient is φ = 231101988.

The previous prime is 231101971. The next prime is 231102017. The reversal of 231101989 is 989101132.

231101989 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., 208224900 + 22877089 = 14430^2 + 4783^2 .

It is a cyclic number.

It is not a de Polignac number, because 231101989 - 2⁹ = 231101477 is a prime.

It is a super-2 number, since 2×231101989² = 106816258639512242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231101089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115550994 + 115550995.

It is an arithmetic number, because the mean of its divisors is an integer number (115550995).

Almost surely, 2^231101989 is an apocalyptic number.

It is an amenable number.

231101989 is a deficient number, since it is larger than the sum of its proper divisors (1).

231101989 is an equidigital number, since it uses as much as digits as its factorization.

231101989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 231101989 is about 15202.0389750849. The cubic root of 231101989 is about 613.6695313054.

The spelling of 231101989 in words is "two hundred thirty-one million, one hundred one thousand, nine hundred eighty-nine".