81794459 has 2 divisors, whose sum is σ = 81794460. Its totient is φ = 81794458.

The previous prime is 81794441. The next prime is 81794483. The reversal of 81794459 is 95449718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81794459 - 2¹⁶ = 81728923 is a prime.

It is not a weakly prime, because it can be changed into another prime (81794359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40897229 + 40897230.

It is an arithmetic number, because the mean of its divisors is an integer number (40897230).

Almost surely, 2^81794459 is an apocalyptic number.

81794459 is a deficient number, since it is larger than the sum of its proper divisors (1).

81794459 is an equidigital number, since it uses as much as digits as its factorization.

81794459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 81794459 is about 9044.0289141510. The cubic root of 81794459 is about 434.0848493027.

The spelling of 81794459 in words is "eighty-one million, seven hundred ninety-four thousand, four hundred fifty-nine".