85090609 has 4 divisors (see below), whose sum is σ = 85518400. Its totient is φ = 84662820.

The previous prime is 85090597. The next prime is 85090613. The reversal of 85090609 is 90609058.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85090609 - 2⁹ = 85090097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85090699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213597 + ... + 213994.

It is an arithmetic number, because the mean of its divisors is an integer number (21379600).

Almost surely, 2^85090609 is an apocalyptic number.

It is an amenable number.

85090609 is a deficient number, since it is larger than the sum of its proper divisors (427791).

85090609 is a wasteful number, since it uses less digits than its factorization.

85090609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427790.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 85090609 is about 9224.4571113969. The cubic root of 85090609 is about 439.8391440248.

The spelling of 85090609 in words is "eighty-five million, ninety thousand, six hundred nine".