12215601 has 12 divisors (see below), whose sum is σ = 17887428. Its totient is φ = 8031744.

The previous prime is 12215591. The next prime is 12215611. The reversal of 12215601 is 10651221.

12215601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12215591) and next prime (12215611).

It can be written as a sum of positive squares in 2 ways, for example, as 7017201 + 5198400 = 2649^2 + 2280^2 .

It is not a de Polignac number, because 12215601 - 2⁷ = 12215473 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (12215611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8640 + ... + 9953.

It is an arithmetic number, because the mean of its divisors is an integer number (1490619).

Almost surely, 2^12215601 is an apocalyptic number.

It is an amenable number.

12215601 is a deficient number, since it is larger than the sum of its proper divisors (5671827).

12215601 is a wasteful number, since it uses less digits than its factorization.

12215601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18672 (or 18669 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 12215601 is about 3495.0824024621. The cubic root of 12215601 is about 230.3058376251.

Adding to 12215601 its reverse (10651221), we get a palindrome (22866822).

The spelling of 12215601 in words is "twelve million, two hundred fifteen thousand, six hundred one".