2001101999609 has 2 divisors, whose sum is σ = 2001101999610. Its totient is φ = 2001101999608.

The previous prime is 2001101999591. The next prime is 2001101999639. The reversal of 2001101999609 is 9069991011002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1932803404009 + 68298595600 = 1390253^2 + 261340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001101999609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2001101999639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000550999804 + 1000550999805.

It is an arithmetic number, because the mean of its divisors is an integer number (1000550999805).

Almost surely, 2^{2001101999609} is an apocalyptic number.

It is an amenable number.

2001101999609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001101999609 is an equidigital number, since it uses as much as digits as its factorization.

2001101999609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 47.

The spelling of 2001101999609 in words is "two trillion, one billion, one hundred one million, nine hundred ninety-nine thousand, six hundred nine".