81169386 has 16 divisors (see below), whose sum is σ = 162458784. Its totient is φ = 27036464.

The previous prime is 81169331. The next prime is 81169391. The reversal of 81169386 is 68396118.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon 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, 5485 + ... + 13871.

It is an arithmetic number, because the mean of its divisors is an integer number (10153674).

Almost surely, 2^81169386 is an apocalyptic number.

81169386 is an abundant number, since it is smaller than the sum of its proper divisors (81289398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81169386 is a wasteful number, since it uses less digits than its factorization.

81169386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10005.

The product of its digits is 62208, while the sum is 42.

The square root of 81169386 is about 9009.4054187832. The cubic root of 81169386 is about 432.9762621950.

The spelling of 81169386 in words is "eighty-one million, one hundred sixty-nine thousand, three hundred eighty-six".