22645709 has 2 divisors, whose sum is σ = 22645710. Its totient is φ = 22645708.

The previous prime is 22645687. The next prime is 22645729. The reversal of 22645709 is 90754622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14822500 + 7823209 = 3850^2 + 2797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22645709 is a prime.

It is a super-2 number, since 2×22645709² = 1025656272225362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22645729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11322854 + 11322855.

It is an arithmetic number, because the mean of its divisors is an integer number (11322855).

Almost surely, 2^22645709 is an apocalyptic number.

It is an amenable number.

22645709 is a deficient number, since it is larger than the sum of its proper divisors (1).

22645709 is an equidigital number, since it uses as much as digits as its factorization.

22645709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 22645709 is about 4758.7507814551. The cubic root of 22645709 is about 282.9189086211.

The spelling of 22645709 in words is "twenty-two million, six hundred forty-five thousand, seven hundred nine".