2111969 has 2 divisors, whose sum is σ = 2111970. Its totient is φ = 2111968.

The previous prime is 2111959. The next prime is 2111971. The reversal of 2111969 is 9691112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1721344 + 390625 = 1312^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111969 - 2⁴ = 2111953 is a prime.

It is a super-2 number, since 2×2111969² = 8920826113922, which contains 22 as substring.

Together with 2111971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2111909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055984 + 1055985.

It is an arithmetic number, because the mean of its divisors is an integer number (1055985).

2^2111969 is an apocalyptic number.

It is an amenable number.

2111969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111969 is an equidigital number, since it uses as much as digits as its factorization.

2111969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 29.

The square root of 2111969 is about 1453.2615043412. The cubic root of 2111969 is about 128.3007454596.

The spelling of 2111969 in words is "two million, one hundred eleven thousand, nine hundred sixty-nine".