81733493 has 2 divisors, whose sum is σ = 81733494. Its totient is φ = 81733492.

The previous prime is 81733489. The next prime is 81733507. The reversal of 81733493 is 39433718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53611684 + 28121809 = 7322^2 + 5303^2 .

It is a cyclic number.

It is not a de Polignac number, because 81733493 - 2² = 81733489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81732493) 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, 40866746 + 40866747.

It is an arithmetic number, because the mean of its divisors is an integer number (40866747).

Almost surely, 2^81733493 is an apocalyptic number.

It is an amenable number.

81733493 is a deficient number, since it is larger than the sum of its proper divisors (1).

81733493 is an equidigital number, since it uses as much as digits as its factorization.

81733493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 38.

The square root of 81733493 is about 9040.6577747418. The cubic root of 81733493 is about 433.9769732309.

The spelling of 81733493 in words is "eighty-one million, seven hundred thirty-three thousand, four hundred ninety-three".