2101969 has 4 divisors (see below), whose sum is σ = 2150896. Its totient is φ = 2053044.

The previous prime is 2101961. The next prime is 2102021. The reversal of 2101969 is 9691012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2101969 - 2³ = 2101961 is a prime.

It is a super-2 number, since 2×2101969² = 8836547353922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24399 + ... + 24484.

It is an arithmetic number, because the mean of its divisors is an integer number (537724).

2^2101969 is an apocalyptic number.

It is an amenable number.

2101969 is a deficient number, since it is larger than the sum of its proper divisors (48927).

2101969 is an equidigital number, since it uses as much as digits as its factorization.

2101969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48926.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 2101969 is about 1449.8168849893. The cubic root of 2101969 is about 128.0979271770.

The spelling of 2101969 in words is "two million, one hundred one thousand, nine hundred sixty-nine".