83193821 has 4 divisors (see below), whose sum is σ = 84001632. Its totient is φ = 82386012.

The previous prime is 83193811. The next prime is 83193823. The reversal of 83193821 is 12839138.

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 83193821 - 2⁶ = 83193757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83193823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403751 + ... + 403956.

It is an arithmetic number, because the mean of its divisors is an integer number (21000408).

Almost surely, 2^83193821 is an apocalyptic number.

It is an amenable number.

83193821 is a deficient number, since it is larger than the sum of its proper divisors (807811).

83193821 is a wasteful number, since it uses less digits than its factorization.

83193821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807810.

The product of its digits is 10368, while the sum is 35.

The square root of 83193821 is about 9121.0646856603. The cubic root of 83193821 is about 436.5463457187.

The spelling of 83193821 in words is "eighty-three million, one hundred ninety-three thousand, eight hundred twenty-one".