1321639315 has 8 divisors (see below), whose sum is σ = 1588135248. Its totient is φ = 1055866080.

The previous prime is 1321639289. The next prime is 1321639321. The reversal of 1321639315 is 5139361231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321639315 - 2¹⁵ = 1321606547 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 176641 + ... + 183970.

It is an arithmetic number, because the mean of its divisors is an integer number (198516906).

Almost surely, 2^1321639315 is an apocalyptic number.

1321639315 is a deficient number, since it is larger than the sum of its proper divisors (266495933).

1321639315 is an equidigital number, since it uses as much as digits as its factorization.

1321639315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361349.

The product of its digits is 14580, while the sum is 34.

The square root of 1321639315 is about 36354.3575792504. The cubic root of 1321639315 is about 1097.4152299862.

The spelling of 1321639315 in words is "one billion, three hundred twenty-one million, six hundred thirty-nine thousand, three hundred fifteen".