81071803 has 8 divisors (see below), whose sum is σ = 89049600. Its totient is φ = 73465128.

The previous prime is 81071797. The next prime is 81071807. The reversal of 81071803 is 30817018.

It is a happy number.

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

It is not a de Polignac number, because 81071803 - 2¹⁷ = 80940731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81071807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92323 + ... + 93196.

It is an arithmetic number, because the mean of its divisors is an integer number (11131200).

Almost surely, 2^81071803 is an apocalyptic number.

81071803 is a deficient number, since it is larger than the sum of its proper divisors (7977797).

81071803 is a wasteful number, since it uses less digits than its factorization.

81071803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185561.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 81071803 is about 9003.9881719158. The cubic root of 81071803 is about 432.8026825257.

The spelling of 81071803 in words is "eighty-one million, seventy-one thousand, eight hundred three".