2001811967 has 2 divisors, whose sum is σ = 2001811968. Its totient is φ = 2001811966.

The previous prime is 2001811963. The next prime is 2001811979. The reversal of 2001811967 is 7691181002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001811967 - 2² = 2001811963 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001811963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000905983 + 1000905984.

It is an arithmetic number, because the mean of its divisors is an integer number (1000905984).

Almost surely, 2^2001811967 is an apocalyptic number.

2001811967 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001811967 is an equidigital number, since it uses as much as digits as its factorization.

2001811967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 2001811967 is about 44741.6133705525. The cubic root of 2001811967 is about 1260.3014242745.

Adding to 2001811967 its reverse (7691181002), we get a palindrome (9692992969).

The spelling of 2001811967 in words is "two billion, one million, eight hundred eleven thousand, nine hundred sixty-seven".