22165709 has 2 divisors, whose sum is σ = 22165710. Its totient is φ = 22165708.

The previous prime is 22165681. The next prime is 22165727. The reversal of 22165709 is 90756122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 4609609 = 4190^2 + 2147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22165709 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 (22165009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11082854 + 11082855.

It is an arithmetic number, because the mean of its divisors is an integer number (11082855).

Almost surely, 2^22165709 is an apocalyptic number.

It is an amenable number.

22165709 is a deficient number, since it is larger than the sum of its proper divisors (1).

22165709 is an equidigital number, since it uses as much as digits as its factorization.

22165709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 22165709 is about 4708.0472597458. The cubic root of 22165709 is about 280.9056939650.

The spelling of 22165709 in words is "twenty-two million, one hundred sixty-five thousand, seven hundred nine".