2001811963 has 2 divisors, whose sum is σ = 2001811964. Its totient is φ = 2001811962.

The previous prime is 2001811957. The next prime is 2001811967. The reversal of 2001811963 is 3691181002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001811963 is a prime.

It is a super-2 number, since 2×2001811963² = 8014502270419826738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2001811967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000905981 + 1000905982.

It is an arithmetic number, because the mean of its divisors is an integer number (1000905982).

Almost surely, 2^2001811963 is an apocalyptic number.

2001811963 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001811963 is an equidigital number, since it uses as much as digits as its factorization.

2001811963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2001811963 is about 44741.6133258514. The cubic root of 2001811963 is about 1260.3014234351.

Adding to 2001811963 its reverse (3691181002), we get a palindrome (5692992965).

The spelling of 2001811963 in words is "two billion, one million, eight hundred eleven thousand, nine hundred sixty-three".