85155881 has 4 divisors (see below), whose sum is σ = 85584000. Its totient is φ = 84727764.

The previous prime is 85155871. The next prime is 85155883. The reversal of 85155881 is 18855158.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85155881 - 2²² = 80961577 is a prime.

It is a super-2 number, since 2×85155881² = 14503048137772322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85155883) 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, 213761 + ... + 214158.

It is an arithmetic number, because the mean of its divisors is an integer number (21396000).

Almost surely, 2^85155881 is an apocalyptic number.

It is an amenable number.

85155881 is a deficient number, since it is larger than the sum of its proper divisors (428119).

85155881 is a wasteful number, since it uses less digits than its factorization.

85155881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428118.

The product of its digits is 64000, while the sum is 41.

The square root of 85155881 is about 9227.9944191574. The cubic root of 85155881 is about 439.9515804157.

The spelling of 85155881 in words is "eighty-five million, one hundred fifty-five thousand, eight hundred eighty-one".