81832757 has 2 divisors, whose sum is σ = 81832758. Its totient is φ = 81832756.

The previous prime is 81832727. The next prime is 81832783. The reversal of 81832757 is 75723818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55965361 + 25867396 = 7481^2 + 5086^2 .

It is a cyclic number.

It is not a de Polignac number, because 81832757 - 2⁸ = 81832501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81832727) 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, 40916378 + 40916379.

It is an arithmetic number, because the mean of its divisors is an integer number (40916379).

Almost surely, 2^81832757 is an apocalyptic number.

It is an amenable number.

81832757 is a deficient number, since it is larger than the sum of its proper divisors (1).

81832757 is an equidigital number, since it uses as much as digits as its factorization.

81832757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 41.

The square root of 81832757 is about 9046.1459749442. The cubic root of 81832757 is about 434.1525881519.

The spelling of 81832757 in words is "eighty-one million, eight hundred thirty-two thousand, seven hundred fifty-seven".