85521517 has 4 divisors (see below), whose sum is σ = 85546240. Its totient is φ = 85496796.

The previous prime is 85521497. The next prime is 85521563. The reversal of 85521517 is 71512558.

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 85521517 - 2¹⁵ = 85488749 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 (85521217) 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, 6123 + ... + 14440.

It is an arithmetic number, because the mean of its divisors is an integer number (21386560).

Almost surely, 2^85521517 is an apocalyptic number.

It is an amenable number.

85521517 is a deficient number, since it is larger than the sum of its proper divisors (24723).

85521517 is a wasteful number, since it uses less digits than its factorization.

85521517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24722.

The product of its digits is 14000, while the sum is 34.

The square root of 85521517 is about 9247.7844373666. The cubic root of 85521517 is about 440.5803584839.

The spelling of 85521517 in words is "eighty-five million, five hundred twenty-one thousand, five hundred seventeen".