85556909 has 4 divisors (see below), whose sum is σ = 85835904. Its totient is φ = 85277916.

The previous prime is 85556851. The next prime is 85556951. The reversal of 85556909 is 90965558.

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 a de Polignac number, because none of the positive numbers 2^k-85556909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85556969) 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, 139037 + ... + 139650.

It is an arithmetic number, because the mean of its divisors is an integer number (21458976).

Almost surely, 2^85556909 is an apocalyptic number.

It is an amenable number.

85556909 is a deficient number, since it is larger than the sum of its proper divisors (278995).

85556909 is a wasteful number, since it uses less digits than its factorization.

85556909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278994.

The product of its (nonzero) digits is 486000, while the sum is 47.

The square root of 85556909 is about 9249.6977788466. The cubic root of 85556909 is about 440.6411263082.

The spelling of 85556909 in words is "eighty-five million, five hundred fifty-six thousand, nine hundred nine".