1311312122 has 4 divisors (see below), whose sum is σ = 1966968186. Its totient is φ = 655656060.

The previous prime is 1311312097. The next prime is 1311312127. The reversal of 1311312122 is 2212131131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2212131131 = 7 ⋅316018733.

It can be written as a sum of positive squares in only one way, i.e., 1133062921 + 178249201 = 33661^2 + 13351^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1311312122.

It is not an unprimeable number, because it can be changed into a prime (1311312127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327828029 + ... + 327828032.

Almost surely, 2^1311312122 is an apocalyptic number.

1311312122 is a deficient number, since it is larger than the sum of its proper divisors (655656064).

1311312122 is an equidigital number, since it uses as much as digits as its factorization.

1311312122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655656063.

The product of its digits is 72, while the sum is 17.

The square root of 1311312122 is about 36212.0438804550. The cubic root of 1311312122 is about 1094.5493783254.

Adding to 1311312122 its reverse (2212131131), we get a palindrome (3523443253).

The spelling of 1311312122 in words is "one billion, three hundred eleven million, three hundred twelve thousand, one hundred twenty-two".