81834793 has 4 divisors (see below), whose sum is σ = 81855828. Its totient is φ = 81813760.

The previous prime is 81834791. The next prime is 81834803. The reversal of 81834793 is 39743818.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66129424 + 15705369 = 8132^2 + 3963^2 .

It is a cyclic number.

It is not a de Polignac number, because 81834793 - 2¹ = 81834791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81834791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2788 + ... + 13093.

It is an arithmetic number, because the mean of its divisors is an integer number (20463957).

Almost surely, 2^81834793 is an apocalyptic number.

It is an amenable number.

81834793 is a deficient number, since it is larger than the sum of its proper divisors (21035).

81834793 is a wasteful number, since it uses less digits than its factorization.

81834793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21034.

The product of its digits is 145152, while the sum is 43.

The square root of 81834793 is about 9046.2585083558. The cubic root of 81834793 is about 434.1561886959.

The spelling of 81834793 in words is "eighty-one million, eight hundred thirty-four thousand, seven hundred ninety-three".