81799327 has 2 divisors, whose sum is σ = 81799328. Its totient is φ = 81799326.

The previous prime is 81799307. The next prime is 81799331. The reversal of 81799327 is 72399718.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81799327 is a prime.

It is a super-2 number, since 2×81799327² = 13382259795305858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81799307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40899663 + 40899664.

It is an arithmetic number, because the mean of its divisors is an integer number (40899664).

Almost surely, 2^81799327 is an apocalyptic number.

81799327 is a deficient number, since it is larger than the sum of its proper divisors (1).

81799327 is an equidigital number, since it uses as much as digits as its factorization.

81799327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 46.

The square root of 81799327 is about 9044.2980379906. The cubic root of 81799327 is about 434.0934606567.

The spelling of 81799327 in words is "eighty-one million, seven hundred ninety-nine thousand, three hundred twenty-seven".