81834609 has 8 divisors (see below), whose sum is σ = 109972480. Its totient is φ = 54126576.

The previous prime is 81834589. The next prime is 81834631. The reversal of 81834609 is 90643818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81834609 - 2¹¹ = 81832561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81832609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107014 + ... + 107775.

It is an arithmetic number, because the mean of its divisors is an integer number (13746560).

Almost surely, 2^81834609 is an apocalyptic number.

It is an amenable number.

81834609 is a deficient number, since it is larger than the sum of its proper divisors (28137871).

81834609 is a wasteful number, since it uses less digits than its factorization.

81834609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214919.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 81834609 is about 9046.2483383997. The cubic root of 81834609 is about 434.1558633054.

The spelling of 81834609 in words is "eighty-one million, eight hundred thirty-four thousand, six hundred nine".