1221522325 has 6 divisors (see below), whose sum is σ = 1514687714. Its totient is φ = 977217840.

The previous prime is 1221522319. The next prime is 1221522347. The reversal of 1221522325 is 5232251221.

It can be written as a sum of positive squares in 3 ways, for example, as 3651921 + 1217870404 = 1911^2 + 34898^2 .

It is a sliding number, since 1221522325 = 819200 + 1220703125 and 1/819200 + 1/1220703125 = 0.000001221522325.

It is not a de Polignac number, because 1221522325 - 2³ = 1221522317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 48860893 = 1221522325 / (1 + 2 + 2 + 1 + 5 + 2 + 2 + 3 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221522325.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 24430422 + ... + 24430471.

Almost surely, 2^1221522325 is an apocalyptic number.

It is an amenable number.

1221522325 is a deficient number, since it is larger than the sum of its proper divisors (293165389).

1221522325 is an equidigital number, since it uses as much as digits as its factorization.

1221522325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48860903 (or 48860898 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 1221522325 is about 34950.2836183056. The cubic root of 1221522325 is about 1068.9739851785.

Adding to 1221522325 its reverse (5232251221), we get a palindrome (6453773546).

The spelling of 1221522325 in words is "one billion, two hundred twenty-one million, five hundred twenty-two thousand, three hundred twenty-five".