81794071 has 2 divisors, whose sum is σ = 81794072. Its totient is φ = 81794070.

The previous prime is 81793981. The next prime is 81794077. The reversal of 81794071 is 17049718.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81794071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81794071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81794077) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40897035 + 40897036.

It is an arithmetic number, because the mean of its divisors is an integer number (40897036).

Almost surely, 2^81794071 is an apocalyptic number.

81794071 is a deficient number, since it is larger than the sum of its proper divisors (1).

81794071 is an equidigital number, since it uses as much as digits as its factorization.

81794071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 81794071 is about 9044.0074635086. The cubic root of 81794071 is about 434.0841629270.

The spelling of 81794071 in words is "eighty-one million, seven hundred ninety-four thousand, seventy-one".