1311033161 has 2 divisors, whose sum is σ = 1311033162. Its totient is φ = 1311033160.

The previous prime is 1311033151. The next prime is 1311033169. The reversal of 1311033161 is 1613301131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1209648400 + 101384761 = 34780^2 + 10069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311033161 - 2³⁰ = 237291337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311033169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655516580 + 655516581.

It is an arithmetic number, because the mean of its divisors is an integer number (655516581).

Almost surely, 2^1311033161 is an apocalyptic number.

It is an amenable number.

1311033161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311033161 is an equidigital number, since it uses as much as digits as its factorization.

1311033161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 1311033161 is about 36208.1919045953. The cubic root of 1311033161 is about 1094.4717567741.

Adding to 1311033161 its reverse (1613301131), we get a palindrome (2924334292).

The spelling of 1311033161 in words is "one billion, three hundred eleven million, thirty-three thousand, one hundred sixty-one".