12171653 has 4 divisors (see below), whose sum is σ = 13107948. Its totient is φ = 11235360.

The previous prime is 12171617. The next prime is 12171659. The reversal of 12171653 is 35617121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35617121 = 347 ⋅102643.

It can be written as a sum of positive squares in 2 ways, for example, as 4870849 + 7300804 = 2207^2 + 2702^2 .

It is a cyclic number.

It is not a de Polignac number, because 12171653 - 2⁶ = 12171589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12171659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468128 + ... + 468153.

It is an arithmetic number, because the mean of its divisors is an integer number (3276987).

Almost surely, 2^12171653 is an apocalyptic number.

12171653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12171653 is a deficient number, since it is larger than the sum of its proper divisors (936295).

12171653 is an equidigital number, since it uses as much as digits as its factorization.

12171653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936294.

The product of its digits is 1260, while the sum is 26.

The square root of 12171653 is about 3488.7896181914. The cubic root of 12171653 is about 230.0293157340.

Adding to 12171653 its reverse (35617121), we get a palindrome (47788774).

The spelling of 12171653 in words is "twelve million, one hundred seventy-one thousand, six hundred fifty-three".