1311312122231 has 4 divisors (see below), whose sum is σ = 1312598985000. Its totient is φ = 1310025259464.

The previous prime is 1311312122203. The next prime is 1311312122251. The reversal of 1311312122231 is 1322212131131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311312122231 - 2¹⁸ = 1311311860087 is a prime.

It is a super-2 number, since 2×1311312122231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311312122197 and 1311312122206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311312122251) 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, 643429856 + ... + 643431893.

It is an arithmetic number, because the mean of its divisors is an integer number (328149746250).

Almost surely, 2^{1311312122231} is an apocalyptic number.

1311312122231 is a deficient number, since it is larger than the sum of its proper divisors (1286862769).

1311312122231 is a wasteful number, since it uses less digits than its factorization.

1311312122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286862768.

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

Adding to 1311312122231 its reverse (1322212131131), we get a palindrome (2633524253362).

The spelling of 1311312122231 in words is "one trillion, three hundred eleven billion, three hundred twelve million, one hundred twenty-two thousand, two hundred thirty-one".