1311405321 has 4 divisors (see below), whose sum is σ = 1748540432. Its totient is φ = 874270212.

The previous prime is 1311405223. The next prime is 1311405349. The reversal of 1311405321 is 1235041131.

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 not a de Polignac number, because 1311405321 - 2¹⁵ = 1311372553 is a prime.

It is a super-2 number, since 2×1311405321² = 3439567831894226082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311405391) 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, 218567551 + ... + 218567556.

It is an arithmetic number, because the mean of its divisors is an integer number (437135108).

Almost surely, 2^1311405321 is an apocalyptic number.

It is an amenable number.

1311405321 is a deficient number, since it is larger than the sum of its proper divisors (437135111).

1311405321 is an equidigital number, since it uses as much as digits as its factorization.

1311405321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437135110.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1311405321 is about 36213.3307084560. The cubic root of 1311405321 is about 1094.5753087120.

Adding to 1311405321 its reverse (1235041131), we get a palindrome (2546446452).

The spelling of 1311405321 in words is "one billion, three hundred eleven million, four hundred five thousand, three hundred twenty-one".