85195521 has 6 divisors (see below), whose sum is σ = 123060210. Its totient is φ = 56797008.

The previous prime is 85195511. The next prime is 85195531. The reversal of 85195521 is 12559158.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (85195511) and next prime (85195531).

It can be written as a sum of positive squares in only one way, i.e., 61779600 + 23415921 = 7860^2 + 4839^2 .

It is not a de Polignac number, because 85195521 - 2⁵ = 85195489 is a prime.

It is a super-2 number, since 2×85195521² = 14516553596922882, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85195511) 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 5 ways as a sum of consecutive naturals, for example, 4733076 + ... + 4733093.

It is an arithmetic number, because the mean of its divisors is an integer number (20510035).

Almost surely, 2^85195521 is an apocalyptic number.

It is an amenable number.

85195521 is a deficient number, since it is larger than the sum of its proper divisors (37864689).

85195521 is a wasteful number, since it uses less digits than its factorization.

85195521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9466175 (or 9466172 counting only the distinct ones).

The product of its digits is 18000, while the sum is 36.

The square root of 85195521 is about 9230.1419815732. The cubic root of 85195521 is about 440.0198355383.

The spelling of 85195521 in words is "eighty-five million, one hundred ninety-five thousand, five hundred twenty-one".