1313001321 has 4 divisors (see below), whose sum is σ = 1750668432. Its totient is φ = 875334212.

The previous prime is 1313001241. The next prime is 1313001379. The reversal of 1313001321 is 1231003131.

1313001321 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1231003131 = 3 ⋅410334377.

It is a cyclic number.

It is not a de Polignac number, because 1313001321 - 2²⁶ = 1245892457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1313001321.

It is not an unprimeable number, because it can be changed into a prime (1313001121) 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, 218833551 + ... + 218833556.

It is an arithmetic number, because the mean of its divisors is an integer number (437667108).

Almost surely, 2^1313001321 is an apocalyptic number.

It is an amenable number.

1313001321 is a deficient number, since it is larger than the sum of its proper divisors (437667111).

1313001321 is an equidigital number, since it uses as much as digits as its factorization.

1313001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437667110.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 1313001321 is about 36235.3600920427. The cubic root of 1313001321 is about 1095.0191669045.

Adding to 1313001321 its reverse (1231003131), we get a palindrome (2544004452).

The spelling of 1313001321 in words is "one billion, three hundred thirteen million, one thousand, three hundred twenty-one".