83519921 has 4 divisors (see below), whose sum is σ = 86214144. Its totient is φ = 80825700.

The previous prime is 83519903. The next prime is 83519951. The reversal of 83519921 is 12991538.

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 a de Polignac number, because none of the positive numbers 2^k-83519921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (83519951) 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, 1347065 + ... + 1347126.

It is an arithmetic number, because the mean of its divisors is an integer number (21553536).

Almost surely, 2^83519921 is an apocalyptic number.

It is an amenable number.

83519921 is a deficient number, since it is larger than the sum of its proper divisors (2694223).

83519921 is a wasteful number, since it uses less digits than its factorization.

83519921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694222.

The product of its digits is 19440, while the sum is 38.

The square root of 83519921 is about 9138.9234048656. The cubic root of 83519921 is about 437.1159880421.

The spelling of 83519921 in words is "eighty-three million, five hundred nineteen thousand, nine hundred twenty-one".