1816522003 has 4 divisors (see below), whose sum is σ = 1823590440. Its totient is φ = 1809453568.

The previous prime is 1816521977. The next prime is 1816522013. The reversal of 1816522003 is 3002256181.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1816522003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1816522013) 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, 3533833 + ... + 3534346.

It is an arithmetic number, because the mean of its divisors is an integer number (455897610).

Almost surely, 2^1816522003 is an apocalyptic number.

1816522003 is a deficient number, since it is larger than the sum of its proper divisors (7068437).

1816522003 is an equidigital number, since it uses as much as digits as its factorization.

1816522003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7068436.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1816522003 is about 42620.6757689270. The cubic root of 1816522003 is about 1220.1509270862.

Adding to 1816522003 its reverse (3002256181), we get a palindrome (4818778184).

The spelling of 1816522003 in words is "one billion, eight hundred sixteen million, five hundred twenty-two thousand, three".