2001231503 has 2 divisors, whose sum is σ = 2001231504. Its totient is φ = 2001231502.

The previous prime is 2001231497. The next prime is 2001231521. The reversal of 2001231503 is 3051321002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001231503 - 2¹⁰ = 2001230479 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001231523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000615751 + 1000615752.

It is an arithmetic number, because the mean of its divisors is an integer number (1000615752).

Almost surely, 2^2001231503 is an apocalyptic number.

2001231503 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001231503 is an equidigital number, since it uses as much as digits as its factorization.

2001231503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 2001231503 is about 44735.1260532481. The cubic root of 2001231503 is about 1260.1795962608.

Adding to 2001231503 its reverse (3051321002), we get a palindrome (5052552505).

It can be divided in two parts, 20012 and 31503, that added together give a palindrome (51515).

The spelling of 2001231503 in words is "two billion, one million, two hundred thirty-one thousand, five hundred three".