22509251 has 2 divisors, whose sum is σ = 22509252. Its totient is φ = 22509250.

The previous prime is 22509229. The next prime is 22509299. The reversal of 22509251 is 15290522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22509251 - 2⁶ = 22509187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22509251.

It is not a weakly prime, because it can be changed into another prime (22503251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11254625 + 11254626.

It is an arithmetic number, because the mean of its divisors is an integer number (11254626).

Almost surely, 2^22509251 is an apocalyptic number.

22509251 is a deficient number, since it is larger than the sum of its proper divisors (1).

22509251 is an equidigital number, since it uses as much as digits as its factorization.

22509251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 22509251 is about 4744.3915310606. The cubic root of 22509251 is about 282.3494945819.

Adding to 22509251 its reverse (15290522), we get a palindrome (37799773).

The spelling of 22509251 in words is "twenty-two million, five hundred nine thousand, two hundred fifty-one".