231085489 has 2 divisors, whose sum is σ = 231085490. Its totient is φ = 231085488.

The previous prime is 231085469. The next prime is 231085493. The reversal of 231085489 is 984580132.

231085489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230584225 + 501264 = 15185^2 + 708^2 .

It is a cyclic number.

It is not a de Polignac number, because 231085489 - 2⁵ = 231085457 is a prime.

It is not a weakly prime, because it can be changed into another prime (231085469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115542744 + 115542745.

It is an arithmetic number, because the mean of its divisors is an integer number (115542745).

Almost surely, 2^231085489 is an apocalyptic number.

It is an amenable number.

231085489 is a deficient number, since it is larger than the sum of its proper divisors (1).

231085489 is an equidigital number, since it uses as much as digits as its factorization.

231085489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 231085489 is about 15201.4962750382. The cubic root of 231085489 is about 613.6549262267.

The spelling of 231085489 in words is "two hundred thirty-one million, eighty-five thousand, four hundred eighty-nine".