82040557 has 2 divisors, whose sum is σ = 82040558. Its totient is φ = 82040556.

The previous prime is 82040509. The next prime is 82040561. The reversal of 82040557 is 75504028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49196196 + 32844361 = 7014^2 + 5731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82040557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82040597) 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, 41020278 + 41020279.

It is an arithmetic number, because the mean of its divisors is an integer number (41020279).

Almost surely, 2^82040557 is an apocalyptic number.

It is an amenable number.

82040557 is a deficient number, since it is larger than the sum of its proper divisors (1).

82040557 is an equidigital number, since it uses as much as digits as its factorization.

82040557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 82040557 is about 9057.6242470087. The cubic root of 82040557 is about 434.5197624364.

The spelling of 82040557 in words is "eighty-two million, forty thousand, five hundred fifty-seven".