81250000199 has 2 divisors, whose sum is σ = 81250000200. Its totient is φ = 81250000198.

The previous prime is 81249999977. The next prime is 81250000213. The reversal of 81250000199 is 99100005218.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81250000199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81250002199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40625000099 + 40625000100.

It is an arithmetic number, because the mean of its divisors is an integer number (40625000100).

Almost surely, 2^81250000199 is an apocalyptic number.

81250000199 is a deficient number, since it is larger than the sum of its proper divisors (1).

81250000199 is an equidigital number, since it uses as much as digits as its factorization.

81250000199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 81250000199 in words is "eighty-one billion, two hundred fifty million, one hundred ninety-nine", and thus it is an aban number.