9991373 has 8 divisors (see below), whose sum is σ = 11606400. Its totient is φ = 8423280.

The previous prime is 9991357. The next prime is 9991379. The reversal of 9991373 is 3731999.

9991373 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 9991373 - 2⁴ = 9991357 is a prime.

It is a Duffinian number.

9991373 is strictly pandigital in base 8.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9991373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11273 + ... + 12126.

It is an arithmetic number, because the mean of its divisors is an integer number (1450800).

Almost surely, 2^9991373 is an apocalyptic number.

It is an amenable number.

9991373 is a deficient number, since it is larger than the sum of its proper divisors (1615027).

9991373 is a wasteful number, since it uses less digits than its factorization.

9991373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23467.

The product of its digits is 45927, while the sum is 41.

The square root of 9991373 is about 3160.9133173815. The cubic root of 9991373 is about 215.3814968184.

The spelling of 9991373 in words is "nine million, nine hundred ninety-one thousand, three hundred seventy-three".