81803051 has 8 divisors (see below), whose sum is σ = 89446464. Its totient is φ = 74194120.

The previous prime is 81803039. The next prime is 81803053. The reversal of 81803051 is 15030818.

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

It is not a de Polignac number, because 81803051 - 2¹⁰ = 81802027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81803051.

It is not an unprimeable number, because it can be changed into a prime (81803053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3521 + ... + 13266.

It is an arithmetic number, because the mean of its divisors is an integer number (11180808).

Almost surely, 2^81803051 is an apocalyptic number.

81803051 is a deficient number, since it is larger than the sum of its proper divisors (7643413).

81803051 is a wasteful number, since it uses less digits than its factorization.

81803051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17241.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 81803051 is about 9044.5039112159. The cubic root of 81803051 is about 434.1000480765.

Adding to 81803051 its reverse (15030818), we get a palindrome (96833869).

The spelling of 81803051 in words is "eighty-one million, eight hundred three thousand, fifty-one".