22187609 has 2 divisors, whose sum is σ = 22187610. Its totient is φ = 22187608.

The previous prime is 22187603. The next prime is 22187623. The reversal of 22187609 is 90678122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21187609 + 1000000 = 4603^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 22187609 - 2⁴ = 22187593 is a prime.

It is not a weakly prime, because it can be changed into another prime (22187603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11093804 + 11093805.

It is an arithmetic number, because the mean of its divisors is an integer number (11093805).

Almost surely, 2^22187609 is an apocalyptic number.

It is an amenable number.

22187609 is a deficient number, since it is larger than the sum of its proper divisors (1).

22187609 is an equidigital number, since it uses as much as digits as its factorization.

22187609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 22187609 is about 4710.3724905786. The cubic root of 22187609 is about 280.9981763031.

The spelling of 22187609 in words is "twenty-two million, one hundred eighty-seven thousand, six hundred nine".