1222528649 has 2 divisors, whose sum is σ = 1222528650. Its totient is φ = 1222528648.

The previous prime is 1222528621. The next prime is 1222528717. The reversal of 1222528649 is 9468252221.

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., 904084624 + 318444025 = 30068^2 + 17845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222528649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1222528049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611264324 + 611264325.

It is an arithmetic number, because the mean of its divisors is an integer number (611264325).

Almost surely, 2^1222528649 is an apocalyptic number.

It is an amenable number.

1222528649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222528649 is an equidigital number, since it uses as much as digits as its factorization.

1222528649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The square root of 1222528649 is about 34964.6771613867. The cubic root of 1222528649 is about 1069.2674547514.

The spelling of 1222528649 in words is "one billion, two hundred twenty-two million, five hundred twenty-eight thousand, six hundred forty-nine".