81106599 has 8 divisors (see below), whose sum is σ = 123591040. Its totient is φ = 46346616.

The previous prime is 81106561. The next prime is 81106607. The reversal of 81106599 is 99560118.

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

It is not a de Polignac number, because 81106599 - 2⁹ = 81106087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81106549) 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, 1931089 + ... + 1931130.

It is an arithmetic number, because the mean of its divisors is an integer number (15448880).

Almost surely, 2^81106599 is an apocalyptic number.

81106599 is a deficient number, since it is larger than the sum of its proper divisors (42484441).

81106599 is a wasteful number, since it uses less digits than its factorization.

81106599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3862229.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 81106599 is about 9005.9202195001. The cubic root of 81106599 is about 432.8645932745.

The spelling of 81106599 in words is "eighty-one million, one hundred six thousand, five hundred ninety-nine".