1325644921 has 4 divisors (see below), whose sum is σ = 1403624052. Its totient is φ = 1247665792.

The previous prime is 1325644913. The next prime is 1325644927. The reversal of 1325644921 is 1294465231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 610831225 + 714813696 = 24715^2 + 26736^2 .

It is a cyclic number.

It is not a de Polignac number, because 1325644921 - 2³ = 1325644913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1325644927) 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 in 3 ways as a sum of consecutive naturals, for example, 38989540 + ... + 38989573.

It is an arithmetic number, because the mean of its divisors is an integer number (350906013).

Almost surely, 2^1325644921 is an apocalyptic number.

It is an amenable number.

1325644921 is a deficient number, since it is larger than the sum of its proper divisors (77979131).

1325644921 is an equidigital number, since it uses as much as digits as its factorization.

1325644921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77979130.

The product of its digits is 51840, while the sum is 37.

The square root of 1325644921 is about 36409.4070399396. The cubic root of 1325644921 is about 1098.5227887378.

The spelling of 1325644921 in words is "one billion, three hundred twenty-five million, six hundred forty-four thousand, nine hundred twenty-one".