2197409 has 2 divisors, whose sum is σ = 2197410. Its totient is φ = 2197408.

The previous prime is 2197387. The next prime is 2197411. The reversal of 2197409 is 9047912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2166784 + 30625 = 1472^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2197409 - 2¹² = 2193313 is a prime.

Together with 2197411, 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 (2197469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098704 + 1098705.

It is an arithmetic number, because the mean of its divisors is an integer number (1098705).

2^2197409 is an apocalyptic number.

It is an amenable number.

2197409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2197409 is an equidigital number, since it uses as much as digits as its factorization.

2197409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 2197409 is about 1482.3660141814. The cubic root of 2197409 is about 130.0080665606.

The spelling of 2197409 in words is "two million, one hundred ninety-seven thousand, four hundred nine".