1311405421 has 8 divisors (see below), whose sum is σ = 1397539584. Its totient is φ = 1227697680.

The previous prime is 1311405419. The next prime is 1311405437. The reversal of 1311405421 is 1245041131.

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

It is not a de Polignac number, because 1311405421 - 2¹ = 1311405419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311405392 and 1311405401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311405401) 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 7 ways as a sum of consecutive naturals, for example, 605490 + ... + 607651.

It is an arithmetic number, because the mean of its divisors is an integer number (174692448).

Almost surely, 2^1311405421 is an apocalyptic number.

It is an amenable number.

1311405421 is a deficient number, since it is larger than the sum of its proper divisors (86134163).

1311405421 is a wasteful number, since it uses less digits than its factorization.

1311405421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213211.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1311405421 is about 36213.3320891630. The cubic root of 1311405421 is about 1094.5753365339.

Adding to 1311405421 its reverse (1245041131), we get a palindrome (2556446552).

The spelling of 1311405421 in words is "one billion, three hundred eleven million, four hundred five thousand, four hundred twenty-one".