7115531161 has 4 divisors (see below), whose sum is σ = 7307842852. Its totient is φ = 6923219472.

The previous prime is 7115531149. The next prime is 7115531197. The reversal of 7115531161 is 1611355117.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4774810000 + 2340721161 = 69100^2 + 48381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7115531161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7115531461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96155790 + ... + 96155863.

It is an arithmetic number, because the mean of its divisors is an integer number (1826960713).

Almost surely, 2^7115531161 is an apocalyptic number.

It is an amenable number.

7115531161 is a deficient number, since it is larger than the sum of its proper divisors (192311691).

7115531161 is a wasteful number, since it uses less digits than its factorization.

7115531161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192311690.

The product of its digits is 3150, while the sum is 31.

The square root of 7115531161 is about 84353.6078718628. The cubic root of 7115531161 is about 1923.3977704960.

Adding to 7115531161 its reverse (1611355117), we get a palindrome (8726886278).

The spelling of 7115531161 in words is "seven billion, one hundred fifteen million, five hundred thirty-one thousand, one hundred sixty-one".