2001122503 has 4 divisors (see below), whose sum is σ = 2106444760. Its totient is φ = 1895800248.

The previous prime is 2001122483. The next prime is 2001122527. The reversal of 2001122503 is 3052211002.

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-2001122503 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 (2001122573) 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, 52661100 + ... + 52661137.

It is an arithmetic number, because the mean of its divisors is an integer number (526611190).

Almost surely, 2^2001122503 is an apocalyptic number.

2001122503 is a deficient number, since it is larger than the sum of its proper divisors (105322257).

2001122503 is a wasteful number, since it uses less digits than its factorization.

2001122503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105322256.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2001122503 is about 44733.9077546328. The cubic root of 2001122503 is about 1260.1567166706.

Adding to 2001122503 its reverse (3052211002), we get a palindrome (5053333505).

The spelling of 2001122503 in words is "two billion, one million, one hundred twenty-two thousand, five hundred three".