1252809321 has 4 divisors (see below), whose sum is σ = 1670412432. Its totient is φ = 835206212.

The previous prime is 1252809253. The next prime is 1252809323. The reversal of 1252809321 is 1239082521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1252809321 - 2¹³ = 1252801129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1252809323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208801551 + ... + 208801556.

It is an arithmetic number, because the mean of its divisors is an integer number (417603108).

Almost surely, 2^1252809321 is an apocalyptic number.

It is an amenable number.

1252809321 is a deficient number, since it is larger than the sum of its proper divisors (417603111).

1252809321 is an equidigital number, since it uses as much as digits as its factorization.

1252809321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417603110.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1252809321 is about 35395.0465602180. The cubic root of 1252809321 is about 1078.0237410196.

The spelling of 1252809321 in words is "one billion, two hundred fifty-two million, eight hundred nine thousand, three hundred twenty-one".