2001103551 has 12 divisors (see below), whose sum is σ = 2895071920. Its totient is φ = 1331951040.

The previous prime is 2001103549. The next prime is 2001103561. The reversal of 2001103551 is 1553011002.

2001103551 is a `hidden beast` number, since 2 + 0 + 0 + 110 + 3 + 551 = 666.

It is not a de Polignac number, because 2001103551 - 2¹ = 2001103549 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 (2001103561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170506 + ... + 181863.

Almost surely, 2^2001103551 is an apocalyptic number.

2001103551 is a deficient number, since it is larger than the sum of its proper divisors (893968369).

2001103551 is a wasteful number, since it uses less digits than its factorization.

2001103551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353006 (or 353003 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 2001103551 is about 44733.6959237665. The cubic root of 2001103551 is about 1260.1527384758.

Adding to 2001103551 its reverse (1553011002), we get a palindrome (3554114553).

The spelling of 2001103551 in words is "two billion, one million, one hundred three thousand, five hundred fifty-one".