81793241 has 2 divisors, whose sum is σ = 81793242. Its totient is φ = 81793240.

The previous prime is 81793193. The next prime is 81793279. The reversal of 81793241 is 14239718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81522841 + 270400 = 9029^2 + 520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81793241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81793141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40896620 + 40896621.

It is an arithmetic number, because the mean of its divisors is an integer number (40896621).

Almost surely, 2^81793241 is an apocalyptic number.

It is an amenable number.

81793241 is a deficient number, since it is larger than the sum of its proper divisors (1).

81793241 is an equidigital number, since it uses as much as digits as its factorization.

81793241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 81793241 is about 9043.9615766543. The cubic root of 81793241 is about 434.0826946418.

The spelling of 81793241 in words is "eighty-one million, seven hundred ninety-three thousand, two hundred forty-one".