81797363 has 2 divisors, whose sum is σ = 81797364. Its totient is φ = 81797362.

The previous prime is 81797351. The next prime is 81797381. The reversal of 81797363 is 36379718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81797363 - 2¹⁶ = 81731827 is a prime.

It is not a weakly prime, because it can be changed into another prime (81797383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40898681 + 40898682.

It is an arithmetic number, because the mean of its divisors is an integer number (40898682).

Almost surely, 2^81797363 is an apocalyptic number.

81797363 is a deficient number, since it is larger than the sum of its proper divisors (1).

81797363 is an equidigital number, since it uses as much as digits as its factorization.

81797363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 44.

The square root of 81797363 is about 9044.1894606427. The cubic root of 81797363 is about 434.0899864375.

The spelling of 81797363 in words is "eighty-one million, seven hundred ninety-seven thousand, three hundred sixty-three".