85615891 has 6 divisors (see below), whose sum is σ = 87993780. Its totient is φ = 83300616.

The previous prime is 85615889. The next prime is 85615897. The reversal of 85615891 is 19851658.

It is not a de Polignac number, because 85615891 - 2¹ = 85615889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85615897) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29901 + ... + 32638.

It is an arithmetic number, because the mean of its divisors is an integer number (14665630).

Almost surely, 2^85615891 is an apocalyptic number.

85615891 is a deficient number, since it is larger than the sum of its proper divisors (2377889).

85615891 is an equidigital number, since it uses as much as digits as its factorization.

85615891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62613 (or 62576 counting only the distinct ones).

The product of its digits is 86400, while the sum is 43.

The square root of 85615891 is about 9252.8855499244. The cubic root of 85615891 is about 440.7423607774.

The spelling of 85615891 in words is "eighty-five million, six hundred fifteen thousand, eight hundred ninety-one".