1311623141 has 2 divisors, whose sum is σ = 1311623142. Its totient is φ = 1311623140.

The previous prime is 1311623123. The next prime is 1311623149. The reversal of 1311623141 is 1413261131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1097000641 + 214622500 = 33121^2 + 14650^2 .

It is an emirp because it is prime and its reverse (1413261131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311623141 - 2⁶ = 1311623077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311623149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655811570 + 655811571.

It is an arithmetic number, because the mean of its divisors is an integer number (655811571).

Almost surely, 2^1311623141 is an apocalyptic number.

It is an amenable number.

1311623141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311623141 is an equidigital number, since it uses as much as digits as its factorization.

1311623141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 1311623141 is about 36216.3380396196. The cubic root of 1311623141 is about 1094.6359071125.

Adding to 1311623141 its reverse (1413261131), we get a palindrome (2724884272).

The spelling of 1311623141 in words is "one billion, three hundred eleven million, six hundred twenty-three thousand, one hundred forty-one".