81163606 has 16 divisors (see below), whose sum is σ = 123513984. Its totient is φ = 39996544.

The previous prime is 81163597. The next prime is 81163633. The reversal of 81163606 is 60636118.

It is a congruent number.

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, 43611 + ... + 45433.

It is an arithmetic number, because the mean of its divisors is an integer number (7719624).

Almost surely, 2^81163606 is an apocalyptic number.

81163606 is a deficient number, since it is larger than the sum of its proper divisors (42350378).

81163606 is a wasteful number, since it uses less digits than its factorization.

81163606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 81163606 is about 9009.0846371871. The cubic root of 81163606 is about 432.9659846658.

The spelling of 81163606 in words is "eighty-one million, one hundred sixty-three thousand, six hundred six".