85257091 has 4 divisors (see below), whose sum is σ = 90272232. Its totient is φ = 80241952.

The previous prime is 85257059. The next prime is 85257097. The reversal of 85257091 is 19075258.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85257091 - 2⁵ = 85257059 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 85257091.

It is not an unprimeable number, because it can be changed into a prime (85257097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2507545 + ... + 2507578.

It is an arithmetic number, because the mean of its divisors is an integer number (22568058).

Almost surely, 2^85257091 is an apocalyptic number.

85257091 is a deficient number, since it is larger than the sum of its proper divisors (5015141).

85257091 is a wasteful number, since it uses less digits than its factorization.

85257091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5015140.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 85257091 is about 9233.4766475039. The cubic root of 85257091 is about 440.1258094095.

The spelling of 85257091 in words is "eighty-five million, two hundred fifty-seven thousand, ninety-one".