81682597 has 2 divisors, whose sum is σ = 81682598. Its totient is φ = 81682596.

The previous prime is 81682553. The next prime is 81682607. The reversal of 81682597 is 79528618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77686596 + 3996001 = 8814^2 + 1999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81682597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81682507) 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, 40841298 + 40841299.

It is an arithmetic number, because the mean of its divisors is an integer number (40841299).

Almost surely, 2^81682597 is an apocalyptic number.

It is an amenable number.

81682597 is a deficient number, since it is larger than the sum of its proper divisors (1).

81682597 is an equidigital number, since it uses as much as digits as its factorization.

81682597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 46.

The square root of 81682597 is about 9037.8424969680. The cubic root of 81682597 is about 433.8868743925.

The spelling of 81682597 in words is "eighty-one million, six hundred eighty-two thousand, five hundred ninety-seven".