82904981 has 2 divisors, whose sum is σ = 82904982. Its totient is φ = 82904980.

The previous prime is 82904957. The next prime is 82905047. The reversal of 82904981 is 18940928.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69872881 + 13032100 = 8359^2 + 3610^2 .

It is a cyclic number.

It is not a de Polignac number, because 82904981 - 2²⁶ = 15796117 is a prime.

It is a super-2 number, since 2×82904981² = 13746471749220722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82904281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41452490 + 41452491.

It is an arithmetic number, because the mean of its divisors is an integer number (41452491).

Almost surely, 2^82904981 is an apocalyptic number.

It is an amenable number.

82904981 is a deficient number, since it is larger than the sum of its proper divisors (1).

82904981 is an equidigital number, since it uses as much as digits as its factorization.

82904981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 82904981 is about 9105.2172406813. The cubic root of 82904981 is about 436.0405459165.

The spelling of 82904981 in words is "eighty-two million, nine hundred four thousand, nine hundred eighty-one".