2003551 has 4 divisors (see below), whose sum is σ = 2185704. Its totient is φ = 1821400.

The previous prime is 2003509. The next prime is 2003557. The reversal of 2003551 is 1553002.

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

It is a cyclic number.

It is not a de Polignac number, because 2003551 - 2¹³ = 1995359 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 (2003557) 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 3 ways as a sum of consecutive naturals, for example, 91060 + ... + 91081.

It is an arithmetic number, because the mean of its divisors is an integer number (546426).

2^2003551 is an apocalyptic number.

2003551 is a deficient number, since it is larger than the sum of its proper divisors (182153).

2003551 is a wasteful number, since it uses less digits than its factorization.

2003551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182152.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 2003551 is about 1415.4684736864. The cubic root of 2003551 is about 126.0666272296.

Adding to 2003551 its reverse (1553002), we get a palindrome (3556553).

The spelling of 2003551 in words is "two million, three thousand, five hundred fifty-one".