85815917 has 16 divisors (see below), whose sum is σ = 96245952. Its totient is φ = 75841920.

The previous prime is 85815893. The next prime is 85815923. The reversal of 85815917 is 71951858.

It is a happy number.

It is not a de Polignac number, because 85815917 - 2⁶ = 85815853 is a prime.

It is a super-2 number, since 2×85815917² = 14728743221101778, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85815217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187553 + ... + 188009.

It is an arithmetic number, because the mean of its divisors is an integer number (6015372).

Almost surely, 2^85815917 is an apocalyptic number.

It is an amenable number.

85815917 is a deficient number, since it is larger than the sum of its proper divisors (10430035).

85815917 is a wasteful number, since it uses less digits than its factorization.

85815917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908.

The product of its digits is 100800, while the sum is 44.

The square root of 85815917 is about 9263.6880884451. The cubic root of 85815917 is about 441.0853320134.

The spelling of 85815917 in words is "eighty-five million, eight hundred fifteen thousand, nine hundred seventeen".