231163489 has 2 divisors, whose sum is σ = 231163490. Its totient is φ = 231163488.

The previous prime is 231163487. The next prime is 231163523. The reversal of 231163489 is 984361132.

231163489 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., 230523489 + 640000 = 15183^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 231163489 - 2¹ = 231163487 is a prime.

Together with 231163487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (231163487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115581744 + 115581745.

It is an arithmetic number, because the mean of its divisors is an integer number (115581745).

Almost surely, 2^231163489 is an apocalyptic number.

It is an amenable number.

231163489 is a deficient number, since it is larger than the sum of its proper divisors (1).

231163489 is an equidigital number, since it uses as much as digits as its factorization.

231163489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 231163489 is about 15204.0615955080. The cubic root of 231163489 is about 613.7239622936.

The spelling of 231163489 in words is "two hundred thirty-one million, one hundred sixty-three thousand, four hundred eighty-nine".