81594847 has 2 divisors, whose sum is σ = 81594848. Its totient is φ = 81594846.

The previous prime is 81594787. The next prime is 81594889. The reversal of 81594847 is 74849518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81594847 - 2¹⁹ = 81070559 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81594797 and 81594806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81594047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40797423 + 40797424.

It is an arithmetic number, because the mean of its divisors is an integer number (40797424).

Almost surely, 2^81594847 is an apocalyptic number.

81594847 is a deficient number, since it is larger than the sum of its proper divisors (1).

81594847 is an equidigital number, since it uses as much as digits as its factorization.

81594847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 81594847 is about 9032.9866046618. The cubic root of 81594847 is about 433.7314466896.

The spelling of 81594847 in words is "eighty-one million, five hundred ninety-four thousand, eight hundred forty-seven".