85155261 has 16 divisors (see below), whose sum is σ = 121673664. Its totient is φ = 52784384.

The previous prime is 85155229. The next prime is 85155263. The reversal of 85155261 is 16255158.

It is a cyclic number.

It is not a de Polignac number, because 85155261 - 2⁵ = 85155229 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85155263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5826 + ... + 14291.

It is an arithmetic number, because the mean of its divisors is an integer number (7604604).

Almost surely, 2^85155261 is an apocalyptic number.

It is an amenable number.

85155261 is a deficient number, since it is larger than the sum of its proper divisors (36518403).

85155261 is a wasteful number, since it uses less digits than its factorization.

85155261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20220.

The product of its digits is 12000, while the sum is 33.

The square root of 85155261 is about 9227.9608256646. The cubic root of 85155261 is about 439.9505126850.

The spelling of 85155261 in words is "eighty-five million, one hundred fifty-five thousand, two hundred sixty-one".