85251691 has 8 divisors (see below), whose sum is σ = 98085600. Its totient is φ = 72581568.

The previous prime is 85251659. The next prime is 85251697. The reversal of 85251691 is 19615258.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85251691 - 2⁵ = 85251659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85251691.

It is not an unprimeable number, because it can be changed into a prime (85251697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39826 + ... + 41911.

It is an arithmetic number, because the mean of its divisors is an integer number (12260700).

Almost surely, 2^85251691 is an apocalyptic number.

85251691 is a deficient number, since it is larger than the sum of its proper divisors (12833909).

85251691 is a wasteful number, since it uses less digits than its factorization.

85251691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81893.

The product of its digits is 21600, while the sum is 37.

The square root of 85251691 is about 9233.1842286397. The cubic root of 85251691 is about 440.1165170073.

The spelling of 85251691 in words is "eighty-five million, two hundred fifty-one thousand, six hundred ninety-one".