9138248209 has 4 divisors (see below), whose sum is σ = 9138539520. Its totient is φ = 9137956900.

The previous prime is 9138248177. The next prime is 9138248237. The reversal of 9138248209 is 9028428319.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9028428319 = 36583 ⋅246793.

It is a cyclic number.

It is not a de Polignac number, because 9138248209 - 2⁵ = 9138248177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9138248269) 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, 92017 + ... + 163534.

It is an arithmetic number, because the mean of its divisors is an integer number (2284634880).

Almost surely, 2^9138248209 is an apocalyptic number.

It is an amenable number.

9138248209 is a deficient number, since it is larger than the sum of its proper divisors (291311).

9138248209 is a wasteful number, since it uses less digits than its factorization.

9138248209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291310.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 9138248209 is about 95594.1850166630. The cubic root of 9138248209 is about 2090.6804106998.

The spelling of 9138248209 in words is "nine billion, one hundred thirty-eight million, two hundred forty-eight thousand, two hundred nine".