81859105 has 8 divisors (see below), whose sum is σ = 98280000. Its totient is φ = 65454576.

The previous prime is 81859091. The next prime is 81859111. The reversal of 81859105 is 50195818.

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

It is a cyclic number.

It is not a de Polignac number, because 81859105 - 2¹³ = 81850913 is a prime.

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, 15156 + ... + 19834.

It is an arithmetic number, because the mean of its divisors is an integer number (12285000).

Almost surely, 2^81859105 is an apocalyptic number.

It is an amenable number.

81859105 is a deficient number, since it is larger than the sum of its proper divisors (16420895).

81859105 is a wasteful number, since it uses less digits than its factorization.

81859105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8183.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 81859105 is about 9047.6021685306. The cubic root of 81859105 is about 434.1991783982.

The spelling of 81859105 in words is "eighty-one million, eight hundred fifty-nine thousand, one hundred five".