1312131322 has 4 divisors (see below), whose sum is σ = 1968196986. Its totient is φ = 656065660.

The previous prime is 1312131311. The next prime is 1312131329. The reversal of 1312131322 is 2231312131.

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

It can be written as a sum of positive squares in only one way, i.e., 1119504681 + 192626641 = 33459^2 + 13879^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1312131322.

It is not an unprimeable number, because it can be changed into a prime (1312131329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328032829 + ... + 328032832.

Almost surely, 2^1312131322 is an apocalyptic number.

1312131322 is a deficient number, since it is larger than the sum of its proper divisors (656065664).

1312131322 is an equidigital number, since it uses as much as digits as its factorization.

1312131322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656065663.

The product of its digits is 216, while the sum is 19.

The square root of 1312131322 is about 36223.3532682992. The cubic root of 1312131322 is about 1094.7772590315. Note that the first 3 decimals are identical.

Adding to 1312131322 its reverse (2231312131), we get a palindrome (3543443453).

The spelling of 1312131322 in words is "one billion, three hundred twelve million, one hundred thirty-one thousand, three hundred twenty-two".