2109911 has 2 divisors, whose sum is σ = 2109912. Its totient is φ = 2109910.

The previous prime is 2109889. The next prime is 2109941. The reversal of 2109911 is 1199012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2109911 - 2¹⁴ = 2093527 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054955 + 1054956.

It is an arithmetic number, because the mean of its divisors is an integer number (1054956).

2^2109911 is an apocalyptic number.

2109911 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109911 is an equidigital number, since it uses as much as digits as its factorization.

2109911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 2109911 is about 1452.5532692469. The cubic root of 2109911 is about 128.2590578613.

The spelling of 2109911 in words is "two million, one hundred nine thousand, nine hundred eleven".