82164991 has 2 divisors, whose sum is σ = 82164992. Its totient is φ = 82164990.

The previous prime is 82164983. The next prime is 82165003. The reversal of 82164991 is 19946128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82164991 - 2³ = 82164983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82164941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41082495 + 41082496.

It is an arithmetic number, because the mean of its divisors is an integer number (41082496).

Almost surely, 2^82164991 is an apocalyptic number.

82164991 is a deficient number, since it is larger than the sum of its proper divisors (1).

82164991 is an equidigital number, since it uses as much as digits as its factorization.

82164991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 82164991 is about 9064.4906641245. The cubic root of 82164991 is about 434.7393356204.

The spelling of 82164991 in words is "eighty-two million, one hundred sixty-four thousand, nine hundred ninety-one".