2122409 has 2 divisors, whose sum is σ = 2122410. Its totient is φ = 2122408.

The previous prime is 2122381. The next prime is 2122427. The reversal of 2122409 is 9042212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1960000 + 162409 = 1400^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122409 - 2¹² = 2118313 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2122459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061204 + 1061205.

It is an arithmetic number, because the mean of its divisors is an integer number (1061205).

2^2122409 is an apocalyptic number.

It is an amenable number.

2122409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122409 is an equidigital number, since it uses as much as digits as its factorization.

2122409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2122409 is about 1456.8489969794. The cubic root of 2122409 is about 128.5118058062.

The spelling of 2122409 in words is "two million, one hundred twenty-two thousand, four hundred nine".