1221522317 has 2 divisors, whose sum is σ = 1221522318. Its totient is φ = 1221522316.

The previous prime is 1221522257. The next prime is 1221522319. The reversal of 1221522317 is 7132251221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784336036 + 437186281 = 28006^2 + 20909^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221522317 - 2²⁶ = 1154413453 is a prime.

Together with 1221522319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221522319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610761158 + 610761159.

It is an arithmetic number, because the mean of its divisors is an integer number (610761159).

Almost surely, 2^1221522317 is an apocalyptic number.

It is an amenable number.

1221522317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221522317 is an equidigital number, since it uses as much as digits as its factorization.

1221522317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 26.

The square root of 1221522317 is about 34950.2835038573. The cubic root of 1221522317 is about 1068.9739828448.

Adding to 1221522317 its reverse (7132251221), we get a palindrome (8353773538).

The spelling of 1221522317 in words is "one billion, two hundred twenty-one million, five hundred twenty-two thousand, three hundred seventeen".