1311623 has 2 divisors, whose sum is σ = 1311624. Its totient is φ = 1311622.

The previous prime is 1311619. The next prime is 1311643. The reversal of 1311623 is 3261131.

It is a weak prime.

It is an emirp because it is prime and its reverse (3261131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311623 - 2² = 1311619 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655811 + 655812.

It is an arithmetic number, because the mean of its divisors is an integer number (655812).

2^1311623 is an apocalyptic number.

1311623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311623 is an equidigital number, since it uses as much as digits as its factorization.

1311623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 17.

The square root of 1311623 is about 1145.2611055999. The cubic root of 1311623 is about 109.4635867888.

Adding to 1311623 its reverse (3261131), we get a palindrome (4572754).

The spelling of 1311623 in words is "one million, three hundred eleven thousand, six hundred twenty-three".