83316721 has 2 divisors, whose sum is σ = 83316722. Its totient is φ = 83316720.

The previous prime is 83316713. The next prime is 83316733. The reversal of 83316721 is 12761338.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52403121 + 30913600 = 7239^2 + 5560^2 .

It is a cyclic number.

It is not a de Polignac number, because 83316721 - 2³ = 83316713 is a prime.

It is not a weakly prime, because it can be changed into another prime (83316521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41658360 + 41658361.

It is an arithmetic number, because the mean of its divisors is an integer number (41658361).

Almost surely, 2^83316721 is an apocalyptic number.

It is an amenable number.

83316721 is a deficient number, since it is larger than the sum of its proper divisors (1).

83316721 is an equidigital number, since it uses as much as digits as its factorization.

83316721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 83316721 is about 9127.7993514319. The cubic root of 83316721 is about 436.7612060195.

The spelling of 83316721 in words is "eighty-three million, three hundred sixteen thousand, seven hundred twenty-one".