85670489 has 2 divisors, whose sum is σ = 85670490. Its totient is φ = 85670488.

The previous prime is 85670479. The next prime is 85670509. The reversal of 85670489 is 98407658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55056400 + 30614089 = 7420^2 + 5533^2 .

It is a cyclic number.

It is not a de Polignac number, because 85670489 - 2²⁴ = 68893273 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85670479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42835244 + 42835245.

It is an arithmetic number, because the mean of its divisors is an integer number (42835245).

Almost surely, 2^85670489 is an apocalyptic number.

It is an amenable number.

85670489 is a deficient number, since it is larger than the sum of its proper divisors (1).

85670489 is an equidigital number, since it uses as much as digits as its factorization.

85670489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 85670489 is about 9255.8354025987. The cubic root of 85670489 is about 440.8360292843.

The spelling of 85670489 in words is "eighty-five million, six hundred seventy thousand, four hundred eighty-nine".