85618789 has 2 divisors, whose sum is σ = 85618790. Its totient is φ = 85618788.

The previous prime is 85618781. The next prime is 85618859. The reversal of 85618789 is 98781658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 13198689 = 8510^2 + 3633^2 .

It is a cyclic number.

It is not a de Polignac number, because 85618789 - 2³ = 85618781 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85618781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42809394 + 42809395.

It is an arithmetic number, because the mean of its divisors is an integer number (42809395).

Almost surely, 2^85618789 is an apocalyptic number.

It is an amenable number.

85618789 is a deficient number, since it is larger than the sum of its proper divisors (1).

85618789 is an equidigital number, since it uses as much as digits as its factorization.

85618789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 52.

The square root of 85618789 is about 9253.0421483964. The cubic root of 85618789 is about 440.7473335963.

The spelling of 85618789 in words is "eighty-five million, six hundred eighteen thousand, seven hundred eighty-nine".