81799363 has 2 divisors, whose sum is σ = 81799364. Its totient is φ = 81799362.

The previous prime is 81799337. The next prime is 81799391. The reversal of 81799363 is 36399718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81799363 - 2⁵ = 81799331 is a prime.

It is a super-2 number, since 2×81799363² = 13382271574411538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81799463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40899681 + 40899682.

It is an arithmetic number, because the mean of its divisors is an integer number (40899682).

Almost surely, 2^81799363 is an apocalyptic number.

81799363 is a deficient number, since it is larger than the sum of its proper divisors (1).

81799363 is an equidigital number, since it uses as much as digits as its factorization.

81799363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 81799363 is about 9044.3000281946. The cubic root of 81799363 is about 434.0935243384.

The spelling of 81799363 in words is "eighty-one million, seven hundred ninety-nine thousand, three hundred sixty-three".