9138809539 has 2 divisors, whose sum is σ = 9138809540. Its totient is φ = 9138809538.

The previous prime is 9138809521. The next prime is 9138809549. The reversal of 9138809539 is 9359088319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9138809539 - 2¹⁷ = 9138678467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9138809539.

It is not a weakly prime, because it can be changed into another prime (9138809549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4569404769 + 4569404770.

It is an arithmetic number, because the mean of its divisors is an integer number (4569404770).

Almost surely, 2^9138809539 is an apocalyptic number.

9138809539 is a deficient number, since it is larger than the sum of its proper divisors (1).

9138809539 is an equidigital number, since it uses as much as digits as its factorization.

9138809539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 55.

The square root of 9138809539 is about 95597.1209765231. The cubic root of 9138809539 is about 2090.7232175041.

The spelling of 9138809539 in words is "nine billion, one hundred thirty-eight million, eight hundred nine thousand, five hundred thirty-nine".