1311405223 has 2 divisors, whose sum is σ = 1311405224. Its totient is φ = 1311405222.

The previous prime is 1311405217. The next prime is 1311405349. The reversal of 1311405223 is 3225041131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311405223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311405194 and 1311405203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311405203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655702611 + 655702612.

It is an arithmetic number, because the mean of its divisors is an integer number (655702612).

Almost surely, 2^1311405223 is an apocalyptic number.

1311405223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311405223 is an equidigital number, since it uses as much as digits as its factorization.

1311405223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1311405223 is about 36213.3293553631. The cubic root of 1311405223 is about 1094.5752814465.

Adding to 1311405223 its reverse (3225041131), we get a palindrome (4536446354).

The spelling of 1311405223 in words is "one billion, three hundred eleven million, four hundred five thousand, two hundred twenty-three".