9173138723 has 4 divisors (see below), whose sum is σ = 10483587120. Its totient is φ = 7862690328.

The previous prime is 9173138707. The next prime is 9173138759. The reversal of 9173138723 is 3278313719.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3278313719 = 12781 ⋅256499.

It is a cyclic number.

It is not a de Polignac number, because 9173138723 - 2⁴ = 9173138707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9173138423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655224188 + ... + 655224201.

It is an arithmetic number, because the mean of its divisors is an integer number (2620896780).

Almost surely, 2^9173138723 is an apocalyptic number.

9173138723 is a deficient number, since it is larger than the sum of its proper divisors (1310448397).

9173138723 is a wasteful number, since it uses less digits than its factorization.

9173138723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310448396.

The product of its digits is 190512, while the sum is 44.

The square root of 9173138723 is about 95776.5040236905. The cubic root of 9173138723 is about 2093.3378228032.

The spelling of 9173138723 in words is "nine billion, one hundred seventy-three million, one hundred thirty-eight thousand, seven hundred twenty-three".