2001311987 has 2 divisors, whose sum is σ = 2001311988. Its totient is φ = 2001311986.

The previous prime is 2001311957. The next prime is 2001311993. The reversal of 2001311987 is 7891131002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2001311987 - 2¹⁰ = 2001310963 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001311957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000655993 + 1000655994.

It is an arithmetic number, because the mean of its divisors is an integer number (1000655994).

Almost surely, 2^2001311987 is an apocalyptic number.

2001311987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001311987 is an equidigital number, since it uses as much as digits as its factorization.

2001311987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 2001311987 is about 44736.0256057688. The cubic root of 2001311987 is about 1260.1964896812.

Adding to 2001311987 its reverse (7891131002), we get a palindrome (9892442989).

The spelling of 2001311987 in words is "two billion, one million, three hundred eleven thousand, nine hundred eighty-seven".