81113297 has 2 divisors, whose sum is σ = 81113298. Its totient is φ = 81113296.

The previous prime is 81113269. The next prime is 81113303. The reversal of 81113297 is 79231118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76720081 + 4393216 = 8759^2 + 2096^2 .

It is a cyclic number.

It is not a de Polignac number, because 81113297 - 2⁶ = 81113233 is a prime.

It is not a weakly prime, because it can be changed into another prime (81113897) 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, 40556648 + 40556649.

It is an arithmetic number, because the mean of its divisors is an integer number (40556649).

Almost surely, 2^81113297 is an apocalyptic number.

It is an amenable number.

81113297 is a deficient number, since it is larger than the sum of its proper divisors (1).

81113297 is an equidigital number, since it uses as much as digits as its factorization.

81113297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 32.

The square root of 81113297 is about 9006.2920783195. The cubic root of 81113297 is about 432.8765086520.

The spelling of 81113297 in words is "eighty-one million, one hundred thirteen thousand, two hundred ninety-seven".