81705194 has 8 divisors (see below), whose sum is σ = 123369888. Its totient is φ = 40581900.

The previous prime is 81705191. The next prime is 81705229. The reversal of 81705194 is 49150718.

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

It is not an unprimeable number, because it can be changed into a prime (81705191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134972 + ... + 135575.

It is an arithmetic number, because the mean of its divisors is an integer number (15421236).

Almost surely, 2^81705194 is an apocalyptic number.

81705194 is a deficient number, since it is larger than the sum of its proper divisors (41664694).

81705194 is a wasteful number, since it uses less digits than its factorization.

81705194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270700.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 81705194 is about 9039.0925429492. The cubic root of 81705194 is about 433.9268814364.

The spelling of 81705194 in words is "eighty-one million, seven hundred five thousand, one hundred ninety-four".