2123917 has 2 divisors, whose sum is σ = 2123918. Its totient is φ = 2123916.

The previous prime is 2123909. The next prime is 2123939. The reversal of 2123917 is 7193212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2114116 + 9801 = 1454^2 + 99^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123917 - 2³ = 2123909 is a prime.

It is a super-2 number, since 2×2123917² = 9022046845778, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2⁹ + 1 + 2²¹ + 3⁹ + 9⁴ + 1 + 7 .

It is equal to p₁₅₇₄₅₃ and since 2123917 and 157453 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 2123891 and 2123900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061958 + 1061959.

It is an arithmetic number, because the mean of its divisors is an integer number (1061959).

2^2123917 is an apocalyptic number.

It is an amenable number.

2123917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123917 is an equidigital number, since it uses as much as digits as its factorization.

2123917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 25.

The square root of 2123917 is about 1457.3664604347. The cubic root of 2123917 is about 128.5422350532.

The spelling of 2123917 in words is "two million, one hundred twenty-three thousand, nine hundred seventeen".