115242539 has 4 divisors (see below), whose sum is σ = 116299920. Its totient is φ = 114185160.

The previous prime is 115242529. The next prime is 115242551. The reversal of 115242539 is 935242511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935242511 = 7 ⋅133606073.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115242539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115242509) 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 3 ways as a sum of consecutive naturals, for example, 528527 + ... + 528744.

It is an arithmetic number, because the mean of its divisors is an integer number (29074980).

Almost surely, 2^115242539 is an apocalyptic number.

115242539 is a deficient number, since it is larger than the sum of its proper divisors (1057381).

115242539 is a wasteful number, since it uses less digits than its factorization.

115242539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057380.

The product of its digits is 10800, while the sum is 32.

The square root of 115242539 is about 10735.1077777543. The cubic root of 115242539 is about 486.6360436622.

The spelling of 115242539 in words is "one hundred fifteen million, two hundred forty-two thousand, five hundred thirty-nine".