82791217 has 2 divisors, whose sum is σ = 82791218. Its totient is φ = 82791216.

The previous prime is 82791197. The next prime is 82791251. The reversal of 82791217 is 71219728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78694641 + 4096576 = 8871^2 + 2024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82791217 is a prime.

It is a super-2 number, since 2×82791217² = 13708771224682178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (82791257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41395608 + 41395609.

It is an arithmetic number, because the mean of its divisors is an integer number (41395609).

Almost surely, 2^82791217 is an apocalyptic number.

It is an amenable number.

82791217 is a deficient number, since it is larger than the sum of its proper divisors (1).

82791217 is an equidigital number, since it uses as much as digits as its factorization.

82791217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 37.

The square root of 82791217 is about 9098.9679085048. The cubic root of 82791217 is about 435.8410065426.

The spelling of 82791217 in words is "eighty-two million, seven hundred ninety-one thousand, two hundred seventeen".