1222622561 has 4 divisors (see below), whose sum is σ = 1255666452. Its totient is φ = 1189578672.

The previous prime is 1222622551. The next prime is 1222622563. The reversal of 1222622561 is 1652262221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1031630161 + 190992400 = 32119^2 + 13820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222622561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222622563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16521890 + ... + 16521963.

It is an arithmetic number, because the mean of its divisors is an integer number (313916613).

Almost surely, 2^1222622561 is an apocalyptic number.

It is an amenable number.

1222622561 is a deficient number, since it is larger than the sum of its proper divisors (33043891).

1222622561 is an equidigital number, since it uses as much as digits as its factorization.

1222622561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33043890.

The product of its digits is 5760, while the sum is 29.

The square root of 1222622561 is about 34966.0200909397. The cubic root of 1222622561 is about 1069.2948336528.

Adding to 1222622561 its reverse (1652262221), we get a palindrome (2874884782).

The spelling of 1222622561 in words is "one billion, two hundred twenty-two million, six hundred twenty-two thousand, five hundred sixty-one".