1321775252 has 12 divisors (see below), whose sum is σ = 2643550560. Its totient is φ = 566475096.

The previous prime is 1321775251. The next prime is 1321775269. The reversal of 1321775252 is 2525771231.

1321775252 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321775251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23603102 + ... + 23603157.

It is an arithmetic number, because the mean of its divisors is an integer number (220295880).

Almost surely, 2^1321775252 is an apocalyptic number.

It is an amenable number.

1321775252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321775252 is a wasteful number, since it uses less digits than its factorization.

1321775252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47206270 (or 47206268 counting only the distinct ones).

The product of its digits is 29400, while the sum is 35.

The square root of 1321775252 is about 36356.2271419904. The cubic root of 1321775252 is about 1097.4528535189.

The spelling of 1321775252 in words is "one billion, three hundred twenty-one million, seven hundred seventy-five thousand, two hundred fifty-two".