12991173 has 8 divisors (see below), whose sum is σ = 18654048. Its totient is φ = 7994544.

The previous prime is 12991171. The next prime is 12991177. The reversal of 12991173 is 37119921.

12991173 is digitally balanced in base 2 and base 4, 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 not a de Polignac number, because 12991173 - 2¹ = 12991171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991171) 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, 166515 + ... + 166592.

It is an arithmetic number, because the mean of its divisors is an integer number (2331756).

Almost surely, 2^12991173 is an apocalyptic number.

12991173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12991173 is a deficient number, since it is larger than the sum of its proper divisors (5662875).

12991173 is a wasteful number, since it uses less digits than its factorization.

12991173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333123.

The product of its digits is 3402, while the sum is 33.

The square root of 12991173 is about 3604.3269829470. The cubic root of 12991173 is about 235.0802381806.

The spelling of 12991173 in words is "twelve million, nine hundred ninety-one thousand, one hundred seventy-three".