22251709 has 2 divisors, whose sum is σ = 22251710. Its totient is φ = 22251708.

The previous prime is 22251661. The next prime is 22251731. The reversal of 22251709 is 90715222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21576025 + 675684 = 4645^2 + 822^2 .

It is a cyclic number.

It is not a de Polignac number, because 22251709 - 2⁹ = 22251197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22251799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11125854 + 11125855.

It is an arithmetic number, because the mean of its divisors is an integer number (11125855).

Almost surely, 2^22251709 is an apocalyptic number.

It is an amenable number.

22251709 is a deficient number, since it is larger than the sum of its proper divisors (1).

22251709 is an equidigital number, since it uses as much as digits as its factorization.

22251709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 22251709 is about 4717.1717161876. The cubic root of 22251709 is about 281.2685173652.

The spelling of 22251709 in words is "twenty-two million, two hundred fifty-one thousand, seven hundred nine".