83922721 has 4 divisors (see below), whose sum is σ = 85345200. Its totient is φ = 82500244.

The previous prime is 83922719. The next prime is 83922737. The reversal of 83922721 is 12722938.

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 83922721 - 2¹ = 83922719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83922701) 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, 711151 + ... + 711268.

It is an arithmetic number, because the mean of its divisors is an integer number (21336300).

Almost surely, 2^83922721 is an apocalyptic number.

It is an amenable number.

83922721 is a deficient number, since it is larger than the sum of its proper divisors (1422479).

83922721 is a wasteful number, since it uses less digits than its factorization.

83922721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422478.

The product of its digits is 12096, while the sum is 34.

The square root of 83922721 is about 9160.9345047326. The cubic root of 83922721 is about 437.8175692661.

The spelling of 83922721 in words is "eighty-three million, nine hundred twenty-two thousand, seven hundred twenty-one".