113723638509 has 16 divisors (see below), whose sum is σ = 163371166784. Its totient is φ = 69951340800.

The previous prime is 113723638489. The next prime is 113723638531. The reversal of 113723638509 is 905836327311.

It is not a de Polignac number, because 113723638509 - 2²⁷ = 113589420781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113723638109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590407 + ... + 758964.

It is an arithmetic number, because the mean of its divisors is an integer number (10210697924).

Almost surely, 2^113723638509 is an apocalyptic number.

It is an amenable number.

113723638509 is a deficient number, since it is larger than the sum of its proper divisors (49647528275).

113723638509 is a wasteful number, since it uses less digits than its factorization.

113723638509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351548.

The product of its (nonzero) digits is 816480, while the sum is 48.

The spelling of 113723638509 in words is "one hundred thirteen billion, seven hundred twenty-three million, six hundred thirty-eight thousand, five hundred nine".