2001811979 has 2 divisors, whose sum is σ = 2001811980. Its totient is φ = 2001811978.

The previous prime is 2001811967. The next prime is 2001811991. The reversal of 2001811979 is 9791181002.

It is a balanced prime because it is at equal distance from previous prime (2001811967) and next prime (2001811991).

It is a cyclic number.

It is not a de Polignac number, because 2001811979 - 2⁴ = 2001811963 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2001811919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000905989 + 1000905990.

It is an arithmetic number, because the mean of its divisors is an integer number (1000905990).

Almost surely, 2^2001811979 is an apocalyptic number.

2001811979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001811979 is an equidigital number, since it uses as much as digits as its factorization.

2001811979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 2001811979 is about 44741.6135046558. The cubic root of 2001811979 is about 1260.3014267928.

The spelling of 2001811979 in words is "two billion, one million, eight hundred eleven thousand, nine hundred seventy-nine".