12171973 has 4 divisors (see below), whose sum is σ = 13278528. Its totient is φ = 11065420.

The previous prime is 12171961. The next prime is 12171977. The reversal of 12171973 is 37917121.

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: 37917121 = 11 ⋅3447011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12171973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12171977) 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, 553261 + ... + 553282.

It is an arithmetic number, because the mean of its divisors is an integer number (3319632).

Almost surely, 2^12171973 is an apocalyptic number.

It is an amenable number.

12171973 is a deficient number, since it is larger than the sum of its proper divisors (1106555).

12171973 is a wasteful number, since it uses less digits than its factorization.

12171973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106554.

The product of its digits is 2646, while the sum is 31.

The square root of 12171973 is about 3488.8354790675. The cubic root of 12171973 is about 230.0313315855.

The spelling of 12171973 in words is "twelve million, one hundred seventy-one thousand, nine hundred seventy-three".