2123969 has 2 divisors, whose sum is σ = 2123970. Its totient is φ = 2123968.

The previous prime is 2123939. The next prime is 2123971. The reversal of 2123969 is 9693212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1787569 + 336400 = 1337^2 + 580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123969 is a prime.

It is a super-2 number, since 2×2123969² = 9022488625922, which contains 22 as substring.

Together with 2123971, 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 (2123909) 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 as a sum of consecutive naturals, namely, 1061984 + 1061985.

It is an arithmetic number, because the mean of its divisors is an integer number (1061985).

2^2123969 is an apocalyptic number.

It is an amenable number.

2123969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123969 is an equidigital number, since it uses as much as digits as its factorization.

2123969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 2123969 is about 1457.3843007251. The cubic root of 2123969 is about 128.5432840806.

The spelling of 2123969 in words is "two million, one hundred twenty-three thousand, nine hundred sixty-nine".