82791661 has 2 divisors, whose sum is σ = 82791662. Its totient is φ = 82791660.

The previous prime is 82791659. The next prime is 82791673. The reversal of 82791661 is 16619728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44475561 + 38316100 = 6669^2 + 6190^2 .

It is a cyclic number.

It is not a de Polignac number, because 82791661 - 2¹ = 82791659 is a prime.

It is a super-2 number, since 2×82791661² = 13708918262277842, which contains 22 as substring.

Together with 82791659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82791601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41395830 + 41395831.

It is an arithmetic number, because the mean of its divisors is an integer number (41395831).

Almost surely, 2^82791661 is an apocalyptic number.

It is an amenable number.

82791661 is a deficient number, since it is larger than the sum of its proper divisors (1).

82791661 is an equidigital number, since it uses as much as digits as its factorization.

82791661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 82791661 is about 9098.9923068437. The cubic root of 82791661 is about 435.8417856634.

The spelling of 82791661 in words is "eighty-two million, seven hundred ninety-one thousand, six hundred sixty-one".