82791817 has 2 divisors, whose sum is σ = 82791818. Its totient is φ = 82791816.

The previous prime is 82791773. The next prime is 82791847. The reversal of 82791817 is 71819728.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82791801 + 16 = 9099^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 82791817 - 2¹¹ = 82789769 is a prime.

It is a super-2 number, since 2×82791817² = 13708969924322978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (82791847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41395908 + 41395909.

It is an arithmetic number, because the mean of its divisors is an integer number (41395909).

Almost surely, 2^82791817 is an apocalyptic number.

It is an amenable number.

82791817 is a deficient number, since it is larger than the sum of its proper divisors (1).

82791817 is an equidigital number, since it uses as much as digits as its factorization.

82791817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 43.

The square root of 82791817 is about 9099.0008792175. Note that the first 3 decimals coincide. The cubic root of 82791817 is about 435.8420594078.

The spelling of 82791817 in words is "eighty-two million, seven hundred ninety-one thousand, eight hundred seventeen".