115111161 has 24 divisors (see below), whose sum is σ = 183272544. Its totient is φ = 69039360.

The previous prime is 115111151. The next prime is 115111163. The reversal of 115111161 is 161111511.

It is a happy number.

It is not a de Polignac number, because 115111161 - 2¹⁰ = 115110137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115111163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3610 + ... + 15596.

It is an arithmetic number, because the mean of its divisors is an integer number (7636356).

Almost surely, 2^115111161 is an apocalyptic number.

115111161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

115111161 is a deficient number, since it is larger than the sum of its proper divisors (68161383).

115111161 is a wasteful number, since it uses less digits than its factorization.

115111161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12101 (or 12098 counting only the distinct ones).

The product of its digits is 30, while the sum is 18.

The square root of 115111161 is about 10728.9869512457. The cubic root of 115111161 is about 486.4510495301.

Adding to 115111161 its reverse (161111511), we get a palindrome (276222672).

The spelling of 115111161 in words is "one hundred fifteen million, one hundred eleven thousand, one hundred sixty-one".