9138791 has 4 divisors (see below), whose sum is σ = 9619800. Its totient is φ = 8657784.

The previous prime is 9138757. The next prime is 9138803. The reversal of 9138791 is 1978319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1978319 = 7 ⋅282617.

It is a cyclic number.

It is not a de Polignac number, because 9138791 - 2¹⁰ = 9137767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9138721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240476 + ... + 240513.

It is an arithmetic number, because the mean of its divisors is an integer number (2404950).

Almost surely, 2^9138791 is an apocalyptic number.

9138791 is a deficient number, since it is larger than the sum of its proper divisors (481009).

9138791 is a wasteful number, since it uses less digits than its factorization.

9138791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481008.

The product of its digits is 13608, while the sum is 38.

The square root of 9138791 is about 3023.0433341254. The cubic root of 9138791 is about 209.0721803755.

The spelling of 9138791 in words is "nine million, one hundred thirty-eight thousand, seven hundred ninety-one".