231022489 has 2 divisors, whose sum is σ = 231022490. Its totient is φ = 231022488.

The previous prime is 231022481. The next prime is 231022513. The reversal of 231022489 is 984220132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230796864 + 225625 = 15192^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 231022489 - 2³ = 231022481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231022489.

It is not a weakly prime, because it can be changed into another prime (231022481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115511244 + 115511245.

It is an arithmetic number, because the mean of its divisors is an integer number (115511245).

Almost surely, 2^231022489 is an apocalyptic number.

It is an amenable number.

231022489 is a deficient number, since it is larger than the sum of its proper divisors (1).

231022489 is an equidigital number, since it uses as much as digits as its factorization.

231022489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 231022489 is about 15199.4239693483. The cubic root of 231022489 is about 613.5991549847.

The spelling of 231022489 in words is "two hundred thirty-one million, twenty-two thousand, four hundred eighty-nine".