85621523 has 4 divisors (see below), whose sum is σ = 92207808. Its totient is φ = 79035240.

The previous prime is 85621517. The next prime is 85621559. The reversal of 85621523 is 32512658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85621523 - 2⁸ = 85621267 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85621523.

It is not an unprimeable number, because it can be changed into a prime (85621583) 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, 3293123 + ... + 3293148.

It is an arithmetic number, because the mean of its divisors is an integer number (23051952).

Almost surely, 2^85621523 is an apocalyptic number.

85621523 is a deficient number, since it is larger than the sum of its proper divisors (6586285).

85621523 is a wasteful number, since it uses less digits than its factorization.

85621523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6586284.

The product of its digits is 14400, while the sum is 32.

The square root of 85621523 is about 9253.1898824135. The cubic root of 85621523 is about 440.7520248967.

The spelling of 85621523 in words is "eighty-five million, six hundred twenty-one thousand, five hundred twenty-three".