83521873 has 4 divisors (see below), whose sum is σ = 83610468. Its totient is φ = 83433280.

The previous prime is 83521847. The next prime is 83521897. The reversal of 83521873 is 37812538.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67617729 + 15904144 = 8223^2 + 3988^2 .

It is a cyclic number.

It is not a de Polignac number, because 83521873 - 2¹³ = 83513681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83521813) 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, 42868 + ... + 44773.

It is an arithmetic number, because the mean of its divisors is an integer number (20902617).

Almost surely, 2^83521873 is an apocalyptic number.

It is an amenable number.

83521873 is a deficient number, since it is larger than the sum of its proper divisors (88595).

83521873 is an equidigital number, since it uses as much as digits as its factorization.

83521873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88594.

The product of its digits is 40320, while the sum is 37.

The square root of 83521873 is about 9139.0302001908. The cubic root of 83521873 is about 437.1193933924.

The spelling of 83521873 in words is "eighty-three million, five hundred twenty-one thousand, eight hundred seventy-three".