138613913 has 4 divisors (see below), whose sum is σ = 138842880. Its totient is φ = 138384948.

The previous prime is 138613889. The next prime is 138613919. The reversal of 138613913 is 319316831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138613913 - 2²² = 134419609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138613919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113573 + ... + 114786.

It is an arithmetic number, because the mean of its divisors is an integer number (34710720).

Almost surely, 2^138613913 is an apocalyptic number.

It is an amenable number.

138613913 is a deficient number, since it is larger than the sum of its proper divisors (228967).

138613913 is an equidigital number, since it uses as much as digits as its factorization.

138613913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228966.

The product of its digits is 11664, while the sum is 35.

The square root of 138613913 is about 11773.4410008289. The cubic root of 138613913 is about 517.5300929236.

The spelling of 138613913 in words is "one hundred thirty-eight million, six hundred thirteen thousand, nine hundred thirteen".