1222250661 has 8 divisors (see below), whose sum is σ = 1810741760. Its totient is φ = 814833756.

The previous prime is 1222250657. The next prime is 1222250669. The reversal of 1222250661 is 1660522221.

It is not a de Polignac number, because 1222250661 - 2² = 1222250657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 45268543 = 1222250661 / (1 + 2 + 2 + 2 + 2 + 5 + 0 + 6 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222250669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22634245 + ... + 22634298.

It is an arithmetic number, because the mean of its divisors is an integer number (226342720).

Almost surely, 2^1222250661 is an apocalyptic number.

It is an amenable number.

1222250661 is a deficient number, since it is larger than the sum of its proper divisors (588491099).

1222250661 is an equidigital number, since it uses as much as digits as its factorization.

1222250661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45268552 (or 45268546 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1222250661 is about 34960.7016662995. The cubic root of 1222250661 is about 1069.1864025121.

Adding to 1222250661 its reverse (1660522221), we get a palindrome (2882772882).

The spelling of 1222250661 in words is "one billion, two hundred twenty-two million, two hundred fifty thousand, six hundred sixty-one".