115721242 has 24 divisors (see below), whose sum is σ = 217456596. Its totient is φ = 45779328.

The previous prime is 115721231. The next prime is 115721251. The reversal of 115721242 is 242127511.

It can be written as a sum of positive squares in 2 ways, for example, as 114254721 + 1466521 = 10689^2 + 1211^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44143 + ... + 46690.

Almost surely, 2^115721242 is an apocalyptic number.

115721242 is a deficient number, since it is larger than the sum of its proper divisors (101735354).

115721242 is a wasteful number, since it uses less digits than its factorization.

115721242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90862 (or 90855 counting only the distinct ones).

The product of its digits is 1120, while the sum is 25.

The square root of 115721242 is about 10757.3808150497. The cubic root of 115721242 is about 487.3089211265.

Adding to 115721242 its reverse (242127511), we get a palindrome (357848753).

The spelling of 115721242 in words is "one hundred fifteen million, seven hundred twenty-one thousand, two hundred forty-two".