85631489 has 2 divisors, whose sum is σ = 85631490. Its totient is φ = 85631488.

The previous prime is 85631477. The next prime is 85631521. The reversal of 85631489 is 98413658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75550864 + 10080625 = 8692^2 + 3175^2 .

It is a cyclic number.

It is not a de Polignac number, because 85631489 - 2⁴ = 85631473 is a prime.

It is not a weakly prime, because it can be changed into another prime (85631389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42815744 + 42815745.

It is an arithmetic number, because the mean of its divisors is an integer number (42815745).

Almost surely, 2^85631489 is an apocalyptic number.

It is an amenable number.

85631489 is a deficient number, since it is larger than the sum of its proper divisors (1).

85631489 is an equidigital number, since it uses as much as digits as its factorization.

85631489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 44.

The square root of 85631489 is about 9253.7283837381. The cubic root of 85631489 is about 440.7691248193.

The spelling of 85631489 in words is "eighty-five million, six hundred thirty-one thousand, four hundred eighty-nine".