81116003 has 4 divisors (see below), whose sum is σ = 81217080. Its totient is φ = 81014928.

The previous prime is 81115967. The next prime is 81116041. The reversal of 81116003 is 30061118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81116003 - 2⁶ = 81115939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81116093) 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, 49325 + ... + 50942.

It is an arithmetic number, because the mean of its divisors is an integer number (20304270).

Almost surely, 2^81116003 is an apocalyptic number.

81116003 is a deficient number, since it is larger than the sum of its proper divisors (101077).

81116003 is a wasteful number, since it uses less digits than its factorization.

81116003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101076.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 81116003 is about 9006.4423053723. The cubic root of 81116003 is about 432.8813222928.

The spelling of 81116003 in words is "eighty-one million, one hundred sixteen thousand, three".