1311124121 has 2 divisors, whose sum is σ = 1311124122. Its totient is φ = 1311124120.

The previous prime is 1311124103. The next prime is 1311124141. The reversal of 1311124121 is 1214211131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1044259225 + 266864896 = 32315^2 + 16336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311124121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311124121.

It is not a weakly prime, because it can be changed into another prime (1311124141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655562060 + 655562061.

It is an arithmetic number, because the mean of its divisors is an integer number (655562061).

Almost surely, 2^1311124121 is an apocalyptic number.

It is an amenable number.

1311124121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311124121 is an equidigital number, since it uses as much as digits as its factorization.

1311124121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 17.

The square root of 1311124121 is about 36209.4479521575. The cubic root of 1311124121 is about 1094.4970678167.

Adding to 1311124121 its reverse (1214211131), we get a palindrome (2525335252).

The spelling of 1311124121 in words is "one billion, three hundred eleven million, one hundred twenty-four thousand, one hundred twenty-one".