83744821 has 2 divisors, whose sum is σ = 83744822. Its totient is φ = 83744820.

The previous prime is 83744813. The next prime is 83744831. The reversal of 83744821 is 12844738.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78127921 + 5616900 = 8839^2 + 2370^2 .

It is a cyclic number.

It is not a de Polignac number, because 83744821 - 2³ = 83744813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83744831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41872410 + 41872411.

It is an arithmetic number, because the mean of its divisors is an integer number (41872411).

Almost surely, 2^83744821 is an apocalyptic number.

It is an amenable number.

83744821 is a deficient number, since it is larger than the sum of its proper divisors (1).

83744821 is an equidigital number, since it uses as much as digits as its factorization.

83744821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 37.

The square root of 83744821 is about 9151.2196454899. The cubic root of 83744821 is about 437.5079874460.

The spelling of 83744821 in words is "eighty-three million, seven hundred forty-four thousand, eight hundred twenty-one".