2003205551 has 4 divisors (see below), whose sum is σ = 2003473704. Its totient is φ = 2002937400.

The previous prime is 2003205527. The next prime is 2003205559. The reversal of 2003205551 is 1555023002.

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-2003205551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003205559) 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, 122540 + ... + 137921.

It is an arithmetic number, because the mean of its divisors is an integer number (500868426).

Almost surely, 2^2003205551 is an apocalyptic number.

2003205551 is a deficient number, since it is larger than the sum of its proper divisors (268153).

2003205551 is an equidigital number, since it uses as much as digits as its factorization.

2003205551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268152.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 2003205551 is about 44757.1843506716. The cubic root of 2003205551 is about 1260.5938141230.

Adding to 2003205551 its reverse (1555023002), we get a palindrome (3558228553).

The spelling of 2003205551 in words is "two billion, three million, two hundred five thousand, five hundred fifty-one".