115138013 has 4 divisors (see below), whose sum is σ = 115447068. Its totient is φ = 114828960.

The previous prime is 115138003. The next prime is 115138021. The reversal of 115138013 is 310831511.

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 49252324 + 65885689 = 7018^2 + 8117^2 .

It is a cyclic number.

It is not a de Polignac number, because 115138013 - 2⁶ = 115137949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 115138013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115138003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153968 + ... + 154713.

It is an arithmetic number, because the mean of its divisors is an integer number (28861767).

Almost surely, 2^115138013 is an apocalyptic number.

It is an amenable number.

115138013 is a deficient number, since it is larger than the sum of its proper divisors (309055).

115138013 is an equidigital number, since it uses as much as digits as its factorization.

115138013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309054.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 115138013 is about 10730.2382545776. The cubic root of 115138013 is about 486.4888714289.

Adding to 115138013 its reverse (310831511), we get a palindrome (425969524).

The spelling of 115138013 in words is "one hundred fifteen million, one hundred thirty-eight thousand, thirteen".