11981173 has 4 divisors (see below), whose sum is σ = 12015468. Its totient is φ = 11946880.

The previous prime is 11981161. The next prime is 11981197. The reversal of 11981173 is 37118911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37118911 = 457 ⋅81223.

It can be written as a sum of positive squares in 2 ways, for example, as 5391684 + 6589489 = 2322^2 + 2567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11981173 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11981113) 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, 16618 + ... + 17323.

It is an arithmetic number, because the mean of its divisors is an integer number (3003867).

Almost surely, 2^11981173 is an apocalyptic number.

It is an amenable number.

11981173 is a deficient number, since it is larger than the sum of its proper divisors (34295).

11981173 is an equidigital number, since it uses as much as digits as its factorization.

11981173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34294.

The product of its digits is 1512, while the sum is 31.

The square root of 11981173 is about 3461.3831050608. The cubic root of 11981173 is about 228.8230550899.

The spelling of 11981173 in words is "eleven million, nine hundred eighty-one thousand, one hundred seventy-three".