115211138 has 16 divisors (see below), whose sum is σ = 199886400. Its totient is φ = 48780816.

The previous prime is 115211137. The next prime is 115211141. The reversal of 115211138 is 831112511.

It is a super-4 number, since 4×115211138⁴ (a number of 33 digits) contains 4444 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (115211137) 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 7 ways as a sum of consecutive naturals, for example, 48413 + ... + 50736.

It is an arithmetic number, because the mean of its divisors is an integer number (12492900).

Almost surely, 2^115211138 is an apocalyptic number.

115211138 is a deficient number, since it is larger than the sum of its proper divisors (84675262).

115211138 is an equidigital number, since it uses as much as digits as its factorization.

115211138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99241.

The product of its digits is 240, while the sum is 23.

The square root of 115211138 is about 10733.6451403985. The cubic root of 115211138 is about 486.5918405215.

Adding to 115211138 its reverse (831112511), we get a palindrome (946323649).

The spelling of 115211138 in words is "one hundred fifteen million, two hundred eleven thousand, one hundred thirty-eight".