81863297 has 2 divisors, whose sum is σ = 81863298. Its totient is φ = 81863296.

The previous prime is 81863293. The next prime is 81863303. The reversal of 81863297 is 79236818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75186241 + 6677056 = 8671^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 81863297 - 2² = 81863293 is a prime.

It is not a weakly prime, because it can be changed into another prime (81863293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40931648 + 40931649.

It is an arithmetic number, because the mean of its divisors is an integer number (40931649).

Almost surely, 2^81863297 is an apocalyptic number.

It is an amenable number.

81863297 is a deficient number, since it is larger than the sum of its proper divisors (1).

81863297 is an equidigital number, since it uses as much as digits as its factorization.

81863297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 81863297 is about 9047.8338291549. The cubic root of 81863297 is about 434.2065900432.

The spelling of 81863297 in words is "eighty-one million, eight hundred sixty-three thousand, two hundred ninety-seven".