1311251131 has 2 divisors, whose sum is σ = 1311251132. Its totient is φ = 1311251130.

The previous prime is 1311251129. The next prime is 1311251197. The reversal of 1311251131 is 1311521131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311251131 - 2¹ = 1311251129 is a prime.

It is a super-2 number, since 2×1311251131² = 3438759057097558322, which contains 22 as substring.

Together with 1311251129, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1311251099 and 1311251108.

It is not a weakly prime, because it can be changed into another prime (1311257131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655625565 + 655625566.

It is an arithmetic number, because the mean of its divisors is an integer number (655625566).

Almost surely, 2^1311251131 is an apocalyptic number.

1311251131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311251131 is an equidigital number, since it uses as much as digits as its factorization.

1311251131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90, while the sum is 19.

The square root of 1311251131 is about 36211.2017337177. The cubic root of 1311251131 is about 1094.5324083772.

Adding to 1311251131 its reverse (1311521131), we get a palindrome (2622772262).

The spelling of 1311251131 in words is "one billion, three hundred eleven million, two hundred fifty-one thousand, one hundred thirty-one".