83185621 has 2 divisors, whose sum is σ = 83185622. Its totient is φ = 83185620.

The previous prime is 83185589. The next prime is 83185631. The reversal of 83185621 is 12658138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77686596 + 5499025 = 8814^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 83185621 - 2⁵ = 83185589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83185631) 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, 41592810 + 41592811.

It is an arithmetic number, because the mean of its divisors is an integer number (41592811).

Almost surely, 2^83185621 is an apocalyptic number.

It is an amenable number.

83185621 is a deficient number, since it is larger than the sum of its proper divisors (1).

83185621 is an equidigital number, since it uses as much as digits as its factorization.

83185621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 83185621 is about 9120.6151656563. The cubic root of 83185621 is about 436.5320025155.

The spelling of 83185621 in words is "eighty-three million, one hundred eighty-five thousand, six hundred twenty-one".