81594119 has 2 divisors, whose sum is σ = 81594120. Its totient is φ = 81594118.

The previous prime is 81594089. The next prime is 81594131. The reversal of 81594119 is 91149518.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81594119 is a prime.

It is a super-2 number, since 2×81594119² = 13315200510772322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81594199) 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, 40797059 + 40797060.

It is an arithmetic number, because the mean of its divisors is an integer number (40797060).

Almost surely, 2^81594119 is an apocalyptic number.

81594119 is a deficient number, since it is larger than the sum of its proper divisors (1).

81594119 is an equidigital number, since it uses as much as digits as its factorization.

81594119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 38.

The square root of 81594119 is about 9032.9463078223. The cubic root of 81594119 is about 433.7301567493.

The spelling of 81594119 in words is "eighty-one million, five hundred ninety-four thousand, one hundred nineteen".