9138505 has 8 divisors (see below), whose sum is σ = 11116872. Its totient is φ = 7210368.

The previous prime is 9138491. The next prime is 9138511. The reversal of 9138505 is 5058319.

9138505 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1089936 + 8048569 = 1044^2 + 2837^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9138505 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12154 + ... + 12883.

It is an arithmetic number, because the mean of its divisors is an integer number (1389609).

Almost surely, 2^9138505 is an apocalyptic number.

It is an amenable number.

9138505 is a deficient number, since it is larger than the sum of its proper divisors (1978367).

9138505 is a wasteful number, since it uses less digits than its factorization.

9138505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25115.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 9138505 is about 3022.9960304307. The cubic root of 9138505 is about 209.0699993698.

The spelling of 9138505 in words is "nine million, one hundred thirty-eight thousand, five hundred five".