85101809 has 12 divisors (see below), whose sum is σ = 93277296. Its totient is φ = 77596272.

The previous prime is 85101799. The next prime is 85101823. The reversal of 85101809 is 90810158.

It is a happy number.

It is not a de Polignac number, because 85101809 - 2²⁴ = 68324593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85101509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10994 + ... + 17060.

It is an arithmetic number, because the mean of its divisors is an integer number (7773108).

Almost surely, 2^85101809 is an apocalyptic number.

It is an amenable number.

85101809 is a deficient number, since it is larger than the sum of its proper divisors (8175487).

85101809 is a wasteful number, since it uses less digits than its factorization.

85101809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6176 (or 6163 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 85101809 is about 9225.0641732185. The cubic root of 85101809 is about 439.8584410321.

The spelling of 85101809 in words is "eighty-five million, one hundred one thousand, eight hundred nine".