1311421 has 4 divisors (see below), whose sum is σ = 1319932. Its totient is φ = 1302912.

The previous prime is 1311419. The next prime is 1311433. The reversal of 1311421 is 1241131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1241131 = 139 ⋅8929.

It can be written as a sum of positive squares in 2 ways, for example, as 622521 + 688900 = 789^2 + 830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311421 - 2¹ = 1311419 is a prime.

It is a Duffinian number.

1311421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311481) 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, 4020 + ... + 4333.

It is an arithmetic number, because the mean of its divisors is an integer number (329983).

2^1311421 is an apocalyptic number.

It is an amenable number.

1311421 is a deficient number, since it is larger than the sum of its proper divisors (8511).

1311421 is an equidigital number, since it uses as much as digits as its factorization.

1311421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8510.

The product of its digits is 24, while the sum is 13.

The square root of 1311421 is about 1145.1729127079. The cubic root of 1311421 is about 109.4579670897.

Adding to 1311421 its reverse (1241131), we get a palindrome (2552552).

The spelling of 1311421 in words is "one million, three hundred eleven thousand, four hundred twenty-one".