81834907 has 16 divisors (see below), whose sum is σ = 102240000. Its totient is φ = 63635040.

The previous prime is 81834901. The next prime is 81834917. The reversal of 81834907 is 70943818.

It is not a de Polignac number, because 81834907 - 2³ = 81834899 is a prime.

It is a super-3 number, since 3×81834907³ (a number of 25 digits) contains 333 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81834907.

It is not an unprimeable number, because it can be changed into a prime (81834901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53844 + ... + 55342.

It is an arithmetic number, because the mean of its divisors is an integer number (6390000).

Almost surely, 2^81834907 is an apocalyptic number.

81834907 is a deficient number, since it is larger than the sum of its proper divisors (20405093).

81834907 is a wasteful number, since it uses less digits than its factorization.

81834907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 81834907 is about 9046.2648093011. The cubic root of 81834907 is about 434.1563902963.

The spelling of 81834907 in words is "eighty-one million, eight hundred thirty-four thousand, nine hundred seven".