85413989 has 2 divisors, whose sum is σ = 85413990. Its totient is φ = 85413988.

The previous prime is 85413943. The next prime is 85414009. The reversal of 85413989 is 98931458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64529089 + 20884900 = 8033^2 + 4570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85413989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85413089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42706994 + 42706995.

It is an arithmetic number, because the mean of its divisors is an integer number (42706995).

Almost surely, 2^85413989 is an apocalyptic number.

It is an amenable number.

85413989 is a deficient number, since it is larger than the sum of its proper divisors (1).

85413989 is an equidigital number, since it uses as much as digits as its factorization.

85413989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 47.

The square root of 85413989 is about 9241.9688919624. The cubic root of 85413989 is about 440.3956307280.

The spelling of 85413989 in words is "eighty-five million, four hundred thirteen thousand, nine hundred eighty-nine".