1221522319 has 2 divisors, whose sum is σ = 1221522320. Its totient is φ = 1221522318.

The previous prime is 1221522317. The next prime is 1221522347. The reversal of 1221522319 is 9132251221.

It is an a-pointer prime, because the next prime (1221522347) can be obtained adding 1221522319 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221522319 - 2¹ = 1221522317 is a prime.

It is a super-2 number, since 2×1221522319² = 2984233551630275522, which contains 22 as substring.

Together with 1221522317, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221522317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610761159 + 610761160.

It is an arithmetic number, because the mean of its divisors is an integer number (610761160).

Almost surely, 2^1221522319 is an apocalyptic number.

1221522319 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221522319 is an equidigital number, since it uses as much as digits as its factorization.

1221522319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 1221522319 is about 34950.2835324694. The cubic root of 1221522319 is about 1068.9739834282.

The spelling of 1221522319 in words is "one billion, two hundred twenty-one million, five hundred twenty-two thousand, three hundred nineteen".