22245557 has 2 divisors, whose sum is σ = 22245558. Its totient is φ = 22245556.

The previous prime is 22245533. The next prime is 22245607. The reversal of 22245557 is 75554222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19704721 + 2540836 = 4439^2 + 1594^2 .

It is a cyclic number.

It is not a de Polignac number, because 22245557 - 2¹⁸ = 21983413 is a prime.

It is a super-4 number, since 4×22245557⁴ (a number of 30 digits) contains 4444 as substring.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22245757) 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, 11122778 + 11122779.

It is an arithmetic number, because the mean of its divisors is an integer number (11122779).

Almost surely, 2^22245557 is an apocalyptic number.

It is an amenable number.

22245557 is a deficient number, since it is larger than the sum of its proper divisors (1).

22245557 is an equidigital number, since it uses as much as digits as its factorization.

22245557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28000, while the sum is 32.

The square root of 22245557 is about 4716.5195854571. The cubic root of 22245557 is about 281.2425939120.

Adding to 22245557 its reverse (75554222), we get a palindrome (97799779).

The spelling of 22245557 in words is "twenty-two million, two hundred forty-five thousand, five hundred fifty-seven".