81104187 has 32 divisors (see below), whose sum is σ = 116951040. Its totient is φ = 49871360.

The previous prime is 81104171. The next prime is 81104189. The reversal of 81104187 is 78140118.

It is not a de Polignac number, because 81104187 - 2⁴ = 81104171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81104189) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 288487 + ... + 288767.

It is an arithmetic number, because the mean of its divisors is an integer number (3654720).

Almost surely, 2^81104187 is an apocalyptic number.

81104187 is a deficient number, since it is larger than the sum of its proper divisors (35846853).

81104187 is a wasteful number, since it uses less digits than its factorization.

81104187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 81104187 is about 9005.7863065920. The cubic root of 81104187 is about 432.8603022971.

The spelling of 81104187 in words is "eighty-one million, one hundred four thousand, one hundred eighty-seven".