2111001509 has 2 divisors, whose sum is σ = 2111001510. Its totient is φ = 2111001508.

The previous prime is 2111001491. The next prime is 2111001511. The reversal of 2111001509 is 9051001112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2083648609 + 27352900 = 45647^2 + 5230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111001509 - 2¹⁶ = 2110935973 is a prime.

Together with 2111001511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111001539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055500754 + 1055500755.

It is an arithmetic number, because the mean of its divisors is an integer number (1055500755).

Almost surely, 2^2111001509 is an apocalyptic number.

It is an amenable number.

2111001509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111001509 is an equidigital number, since it uses as much as digits as its factorization.

2111001509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 2111001509 is about 45945.6364522247. The cubic root of 2111001509 is about 1282.8115098388.

The spelling of 2111001509 in words is "two billion, one hundred eleven million, one thousand, five hundred nine".