81952693 has 2 divisors, whose sum is σ = 81952694. Its totient is φ = 81952692.

The previous prime is 81952667. The next prime is 81952697. The reversal of 81952693 is 39625918.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81595089 + 357604 = 9033^2 + 598^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81952693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81952697) 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, 40976346 + 40976347.

It is an arithmetic number, because the mean of its divisors is an integer number (40976347).

Almost surely, 2^81952693 is an apocalyptic number.

It is an amenable number.

81952693 is a deficient number, since it is larger than the sum of its proper divisors (1).

81952693 is an equidigital number, since it uses as much as digits as its factorization.

81952693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 81952693 is about 9052.7726691882. The cubic root of 81952693 is about 434.3645860071.

The spelling of 81952693 in words is "eighty-one million, nine hundred fifty-two thousand, six hundred ninety-three".