81088199 has 2 divisors, whose sum is σ = 81088200. Its totient is φ = 81088198.

The previous prime is 81088193. The next prime is 81088211. The reversal of 81088199 is 99188018.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81088199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81088193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40544099 + 40544100.

It is an arithmetic number, because the mean of its divisors is an integer number (40544100).

Almost surely, 2^81088199 is an apocalyptic number.

81088199 is a deficient number, since it is larger than the sum of its proper divisors (1).

81088199 is an equidigital number, since it uses as much as digits as its factorization.

81088199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 81088199 is about 9004.8986113115. The cubic root of 81088199 is about 432.8318572991.

The spelling of 81088199 in words is "eighty-one million, eighty-eight thousand, one hundred ninety-nine".