85172913 has 24 divisors (see below), whose sum is σ = 145454400. Its totient is φ = 46990944.

The previous prime is 85172881. The next prime is 85172939. The reversal of 85172913 is 31927158.

It is not a de Polignac number, because 85172913 - 2⁵ = 85172881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85170913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21483 + ... + 25136.

It is an arithmetic number, because the mean of its divisors is an integer number (6060600).

Almost surely, 2^85172913 is an apocalyptic number.

It is an amenable number.

85172913 is a deficient number, since it is larger than the sum of its proper divisors (60281487).

85172913 is a wasteful number, since it uses less digits than its factorization.

85172913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46661 (or 46658 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 85172913 is about 9228.9172170954. The cubic root of 85172913 is about 439.9809099844.

The spelling of 85172913 in words is "eighty-five million, one hundred seventy-two thousand, nine hundred thirteen".