81094109 has 16 divisors (see below), whose sum is σ = 88872960. Its totient is φ = 73710000.

The previous prime is 81094103. The next prime is 81094127. The reversal of 81094109 is 90149018.

It is a cyclic number.

It is not a de Polignac number, because 81094109 - 2⁴ = 81094093 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81094103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76634 + ... + 77684.

It is an arithmetic number, because the mean of its divisors is an integer number (5554560).

Almost surely, 2^81094109 is an apocalyptic number.

It is an amenable number.

81094109 is a deficient number, since it is larger than the sum of its proper divisors (7778851).

81094109 is a wasteful number, since it uses less digits than its factorization.

81094109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 81094109 is about 9005.2267600544. The cubic root of 81094109 is about 432.8423724919.

The spelling of 81094109 in words is "eighty-one million, ninety-four thousand, one hundred nine".