81024199 has 2 divisors, whose sum is σ = 81024200. Its totient is φ = 81024198.

The previous prime is 81024161. The next prime is 81024221. The reversal of 81024199 is 99142018.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81024199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81024149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40512099 + 40512100.

It is an arithmetic number, because the mean of its divisors is an integer number (40512100).

Almost surely, 2^81024199 is an apocalyptic number.

81024199 is a deficient number, since it is larger than the sum of its proper divisors (1).

81024199 is an equidigital number, since it uses as much as digits as its factorization.

81024199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 81024199 is about 9001.3442884938. The cubic root of 81024199 is about 432.7179544531.

The spelling of 81024199 in words is "eighty-one million, twenty-four thousand, one hundred ninety-nine".