115128161 has 4 divisors (see below), whose sum is σ = 115320324. Its totient is φ = 114936000.

The previous prime is 115128121. The next prime is 115128193. The reversal of 115128161 is 161821511.

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 52417600 + 62710561 = 7240^2 + 7919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115128161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115128161.

It is not an unprimeable number, because it can be changed into a prime (115128121) 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, 95180 + ... + 96381.

It is an arithmetic number, because the mean of its divisors is an integer number (28830081).

Almost surely, 2^115128161 is an apocalyptic number.

It is an amenable number.

115128161 is a deficient number, since it is larger than the sum of its proper divisors (192163).

115128161 is an equidigital number, since it uses as much as digits as its factorization.

115128161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192162.

The product of its digits is 480, while the sum is 26.

The square root of 115128161 is about 10729.7791682774. The cubic root of 115128161 is about 486.4749952556.

Adding to 115128161 its reverse (161821511), we get a palindrome (276949672).

The spelling of 115128161 in words is "one hundred fifteen million, one hundred twenty-eight thousand, one hundred sixty-one".