12171649 has 6 divisors (see below), whose sum is σ = 14158914. Its totient is φ = 10432800.

The previous prime is 12171617. The next prime is 12171659. The reversal of 12171649 is 94617121.

12171649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8439025 + 3732624 = 2905^2 + 1932^2 .

It is not a de Polignac number, because 12171649 - 2⁵ = 12171617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12171649.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 124152 + ... + 124249.

It is an arithmetic number, because the mean of its divisors is an integer number (2359819).

Almost surely, 2^12171649 is an apocalyptic number.

It is an amenable number.

12171649 is a deficient number, since it is larger than the sum of its proper divisors (1987265).

12171649 is an equidigital number, since it uses as much as digits as its factorization.

12171649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248415 (or 248408 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 12171649 is about 3488.7890449266. The cubic root of 12171649 is about 230.0292905356.

The spelling of 12171649 in words is "twelve million, one hundred seventy-one thousand, six hundred forty-nine".