1312131211 has 2 divisors, whose sum is σ = 1312131212. Its totient is φ = 1312131210.

The previous prime is 1312131199. The next prime is 1312131217. The reversal of 1312131211 is 1121312131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1312131211 - 2¹¹ = 1312129163 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312131217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656065605 + 656065606.

It is an arithmetic number, because the mean of its divisors is an integer number (656065606).

Almost surely, 2^1312131211 is an apocalyptic number.

1312131211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312131211 is an equidigital number, since it uses as much as digits as its factorization.

1312131211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 16.

The square root of 1312131211 is about 36223.3517361384. The cubic root of 1312131211 is about 1094.7772281605. Note that the first 3 decimals are identical.

Adding to 1312131211 its reverse (1121312131), we get a palindrome (2433443342).

The spelling of 1312131211 in words is "one billion, three hundred twelve million, one hundred thirty-one thousand, two hundred eleven".