81341791 has 2 divisors, whose sum is σ = 81341792. Its totient is φ = 81341790.

The previous prime is 81341761. The next prime is 81341809. The reversal of 81341791 is 19714318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81341791 - 2⁵ = 81341759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81341761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40670895 + 40670896.

It is an arithmetic number, because the mean of its divisors is an integer number (40670896).

Almost surely, 2^81341791 is an apocalyptic number.

81341791 is a deficient number, since it is larger than the sum of its proper divisors (1).

81341791 is an equidigital number, since it uses as much as digits as its factorization.

81341791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 81341791 is about 9018.9683999890. The cubic root of 81341791 is about 433.2825947825.

The spelling of 81341791 in words is "eighty-one million, three hundred forty-one thousand, seven hundred ninety-one".