82998991 has 2 divisors, whose sum is σ = 82998992. Its totient is φ = 82998990.

The previous prime is 82998983. The next prime is 82999001. The reversal of 82998991 is 19989928.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82998991 - 2³ = 82998983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82998941) 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, 41499495 + 41499496.

It is an arithmetic number, because the mean of its divisors is an integer number (41499496).

Almost surely, 2^82998991 is an apocalyptic number.

82998991 is a deficient number, since it is larger than the sum of its proper divisors (1).

82998991 is an equidigital number, since it uses as much as digits as its factorization.

82998991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 55.

The square root of 82998991 is about 9110.3782029068. The cubic root of 82998991 is about 436.2052995362.

The spelling of 82998991 in words is "eighty-two million, nine hundred ninety-eight thousand, nine hundred ninety-one".