81799307 has 2 divisors, whose sum is σ = 81799308. Its totient is φ = 81799306.

The previous prime is 81799283. The next prime is 81799327. The reversal of 81799307 is 70399718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81799307 - 2⁶ = 81799243 is a prime.

It is a super-2 number, since 2×81799307² = 13382253251360498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81799327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40899653 + 40899654.

It is an arithmetic number, because the mean of its divisors is an integer number (40899654).

Almost surely, 2^81799307 is an apocalyptic number.

81799307 is a deficient number, since it is larger than the sum of its proper divisors (1).

81799307 is an equidigital number, since it uses as much as digits as its factorization.

81799307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 81799307 is about 9044.2969323215. The cubic root of 81799307 is about 434.0934252780.

The spelling of 81799307 in words is "eighty-one million, seven hundred ninety-nine thousand, three hundred seven".