83331821 has 2 divisors, whose sum is σ = 83331822. Its totient is φ = 83331820.

The previous prime is 83331811. The next prime is 83331863. The reversal of 83331821 is 12813338.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54922921 + 28408900 = 7411^2 + 5330^2 .

It is a cyclic number.

It is not a de Polignac number, because 83331821 - 2²² = 79137517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83331811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41665910 + 41665911.

It is an arithmetic number, because the mean of its divisors is an integer number (41665911).

Almost surely, 2^83331821 is an apocalyptic number.

It is an amenable number.

83331821 is a deficient number, since it is larger than the sum of its proper divisors (1).

83331821 is an equidigital number, since it uses as much as digits as its factorization.

83331821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 83331821 is about 9128.6264574688. The cubic root of 83331821 is about 436.7875900625.

The spelling of 83331821 in words is "eighty-three million, three hundred thirty-one thousand, eight hundred twenty-one".