81920003 has 8 divisors (see below), whose sum is σ = 89574336. Its totient is φ = 74300200.

The previous prime is 81919993. The next prime is 81920021. The reversal of 81920003 is 30002918.

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

It is a cyclic number.

It is not a de Polignac number, because 81920003 - 2⁶ = 81919939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81920023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3533 + ... + 13278.

It is an arithmetic number, because the mean of its divisors is an integer number (11196792).

Almost surely, 2^81920003 is an apocalyptic number.

81920003 is a deficient number, since it is larger than the sum of its proper divisors (7654333).

81920003 is a wasteful number, since it uses less digits than its factorization.

81920003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17265.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 81920003 is about 9050.9669649160. The cubic root of 81920003 is about 434.3068239568.

The spelling of 81920003 in words is "eighty-one million, nine hundred twenty thousand, three".