85902191 has 4 divisors (see below), whose sum is σ = 86221800. Its totient is φ = 85582584.

The previous prime is 85902163. The next prime is 85902199. The reversal of 85902191 is 19120958.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85902191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85902199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159401 + ... + 159938.

It is an arithmetic number, because the mean of its divisors is an integer number (21555450).

Almost surely, 2^85902191 is an apocalyptic number.

85902191 is a deficient number, since it is larger than the sum of its proper divisors (319609).

85902191 is a wasteful number, since it uses less digits than its factorization.

85902191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319608.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 85902191 is about 9268.3434873768. The cubic root of 85902191 is about 441.2330957847.

The spelling of 85902191 in words is "eighty-five million, nine hundred two thousand, one hundred ninety-one".