83169721 has 2 divisors, whose sum is σ = 83169722. Its totient is φ = 83169720.

The previous prime is 83169701. The next prime is 83169727. The reversal of 83169721 is 12796138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69956496 + 13213225 = 8364^2 + 3635^2 .

It is a cyclic number.

It is not a de Polignac number, because 83169721 - 2⁹ = 83169209 is a prime.

It is not a weakly prime, because it can be changed into another prime (83169727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41584860 + 41584861.

It is an arithmetic number, because the mean of its divisors is an integer number (41584861).

Almost surely, 2^83169721 is an apocalyptic number.

It is an amenable number.

83169721 is a deficient number, since it is larger than the sum of its proper divisors (1).

83169721 is an equidigital number, since it uses as much as digits as its factorization.

83169721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 83169721 is about 9119.7434722694. The cubic root of 83169721 is about 436.5041880085.

The spelling of 83169721 in words is "eighty-three million, one hundred sixty-nine thousand, seven hundred twenty-one".