81459794 has 16 divisors (see below), whose sum is σ = 131779032. Its totient is φ = 37542528.

The previous prime is 81459773. The next prime is 81459809. The reversal of 81459794 is 49795418.

It can be written as a sum of positive squares in 4 ways, for example, as 15249025 + 66210769 = 3905^2 + 8137^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20342 + ... + 24014.

Almost surely, 2^81459794 is an apocalyptic number.

81459794 is a deficient number, since it is larger than the sum of its proper divisors (50319238).

81459794 is a wasteful number, since it uses less digits than its factorization.

81459794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4541.

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

The square root of 81459794 is about 9025.5079635442. The cubic root of 81459794 is about 433.4920153895.

The spelling of 81459794 in words is "eighty-one million, four hundred fifty-nine thousand, seven hundred ninety-four".