2198909 has 2 divisors, whose sum is σ = 2198910. Its totient is φ = 2198908.

The previous prime is 2198897. The next prime is 2198981. The reversal of 2198909 is 9098912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428025 + 770884 = 1195^2 + 878^2 .

It is a cyclic number.

It is not a de Polignac number, because 2198909 - 2⁸ = 2198653 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2198309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099454 + 1099455.

It is an arithmetic number, because the mean of its divisors is an integer number (1099455).

2^2198909 is an apocalyptic number.

It is an amenable number.

2198909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2198909 is an equidigital number, since it uses as much as digits as its factorization.

2198909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 2198909 is about 1482.8718757870. The cubic root of 2198909 is about 130.0376419595.

The spelling of 2198909 in words is "two million, one hundred ninety-eight thousand, nine hundred nine".