22649509 has 2 divisors, whose sum is σ = 22649510. Its totient is φ = 22649508.

The previous prime is 22649489. The next prime is 22649563. The reversal of 22649509 is 90594622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21390625 + 1258884 = 4625^2 + 1122^2 .

It is a cyclic number.

It is not a de Polignac number, because 22649509 - 2⁵ = 22649477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22649579) 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, 11324754 + 11324755.

It is an arithmetic number, because the mean of its divisors is an integer number (11324755).

Almost surely, 2^22649509 is an apocalyptic number.

It is an amenable number.

22649509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22649509 is an equidigital number, since it uses as much as digits as its factorization.

22649509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 22649509 is about 4759.1500291544. The cubic root of 22649509 is about 282.9347325420.

The spelling of 22649509 in words is "twenty-two million, six hundred forty-nine thousand, five hundred nine".