9138273691 has 4 divisors (see below), whose sum is σ = 9138529792. Its totient is φ = 9138017592.

The previous prime is 9138273667. The next prime is 9138273701. The reversal of 9138273691 is 1963728319.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9138273691 - 2⁷ = 9138273563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9138273631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63771 + ... + 149476.

It is an arithmetic number, because the mean of its divisors is an integer number (2284632448).

Almost surely, 2^9138273691 is an apocalyptic number.

9138273691 is a deficient number, since it is larger than the sum of its proper divisors (256101).

9138273691 is a wasteful number, since it uses less digits than its factorization.

9138273691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256100.

The product of its digits is 489888, while the sum is 49.

The square root of 9138273691 is about 95594.3182987357. The cubic root of 9138273691 is about 2090.6823539851.

The spelling of 9138273691 in words is "nine billion, one hundred thirty-eight million, two hundred seventy-three thousand, six hundred ninety-one".