12017641 has 4 divisors (see below), whose sum is σ = 12036484. Its totient is φ = 11998800.

The previous prime is 12017639. The next prime is 12017659. The reversal of 12017641 is 14671021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14671021 = 19 ⋅772159.

It can be written as a sum of positive squares in 2 ways, for example, as 10627600 + 1390041 = 3260^2 + 1179^2 .

It is a cyclic number.

It is not a de Polignac number, because 12017641 - 2¹ = 12017639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12017741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8430 + ... + 9751.

It is an arithmetic number, because the mean of its divisors is an integer number (3009121).

Almost surely, 2^12017641 is an apocalyptic number.

12017641 is the 2193-rd centered pentagonal number.

It is an amenable number.

12017641 is a deficient number, since it is larger than the sum of its proper divisors (18843).

12017641 is an equidigital number, since it uses as much as digits as its factorization.

12017641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18842.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 12017641 is about 3466.6469390464. The cubic root of 12017641 is about 229.0549819354.

Adding to 12017641 its reverse (14671021), we get a palindrome (26688662).

The spelling of 12017641 in words is "twelve million, seventeen thousand, six hundred forty-one".