22249309 has 2 divisors, whose sum is σ = 22249310. Its totient is φ = 22249308.

The previous prime is 22249307. The next prime is 22249327. The reversal of 22249309 is 90394222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11868025 + 10381284 = 3445^2 + 3222^2 .

It is a cyclic number.

It is not a de Polignac number, because 22249309 - 2¹ = 22249307 is a prime.

Together with 22249307, it forms a pair of twin primes.

It is equal to p_1403887 and since 22249309 and 1403887 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22249301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11124654 + 11124655.

It is an arithmetic number, because the mean of its divisors is an integer number (11124655).

Almost surely, 2^22249309 is an apocalyptic number.

It is an amenable number.

22249309 is a deficient number, since it is larger than the sum of its proper divisors (1).

22249309 is an equidigital number, since it uses as much as digits as its factorization.

22249309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 22249309 is about 4716.9173196061. The cubic root of 22249309 is about 281.2584047529.

The spelling of 22249309 in words is "twenty-two million, two hundred forty-nine thousand, three hundred nine".