2003222561 has 4 divisors (see below), whose sum is σ = 2003327124. Its totient is φ = 2003118000.

The previous prime is 2003222539. The next prime is 2003222581. The reversal of 2003222561 is 1652223002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 902641936 + 1100580625 = 30044^2 + 33175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003222561 - 2²² = 1999028257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2003222581) 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, 14390 + ... + 64911.

It is an arithmetic number, because the mean of its divisors is an integer number (500831781).

Almost surely, 2^2003222561 is an apocalyptic number.

It is an amenable number.

2003222561 is a deficient number, since it is larger than the sum of its proper divisors (104563).

2003222561 is an equidigital number, since it uses as much as digits as its factorization.

2003222561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104562.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 2003222561 is about 44757.3743756266. The cubic root of 2003222561 is about 1260.5973821776.

Adding to 2003222561 its reverse (1652223002), we get a palindrome (3655445563).

The spelling of 2003222561 in words is "two billion, three million, two hundred twenty-two thousand, five hundred sixty-one".