138066913 has 4 divisors (see below), whose sum is σ = 138282948. Its totient is φ = 137850880.

The previous prime is 138066881. The next prime is 138066917. The reversal of 138066913 is 319660831.

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 131033809 + 7033104 = 11447^2 + 2652^2 .

It is a cyclic number.

It is not a de Polignac number, because 138066913 - 2⁵ = 138066881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138066917) 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, 107056 + ... + 108337.

It is an arithmetic number, because the mean of its divisors is an integer number (34570737).

Almost surely, 2^138066913 is an apocalyptic number.

It is an amenable number.

138066913 is a deficient number, since it is larger than the sum of its proper divisors (216035).

138066913 is an equidigital number, since it uses as much as digits as its factorization.

138066913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216034.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 138066913 is about 11750.1877857335. The cubic root of 138066913 is about 516.8484341837.

The spelling of 138066913 in words is "one hundred thirty-eight million, sixty-six thousand, nine hundred thirteen".