12561471 has 24 divisors (see below), whose sum is σ = 19752096. Its totient is φ = 7646400.

The previous prime is 12561431. The next prime is 12561481. The reversal of 12561471 is 17416521.

It is a happy number.

It is not a de Polignac number, because 12561471 - 2¹¹ = 12559423 is a prime.

It is a super-3 number, since 3×12561471³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561401) 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 23 ways as a sum of consecutive naturals, for example, 11286 + ... + 12348.

It is an arithmetic number, because the mean of its divisors is an integer number (823004).

Almost surely, 2^12561471 is an apocalyptic number.

12561471 is a deficient number, since it is larger than the sum of its proper divisors (7190625).

12561471 is a wasteful number, since it uses less digits than its factorization.

12561471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183 (or 1180 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 12561471 is about 3544.2165565891. The cubic root of 12561471 is about 232.4592505761.

Adding to 12561471 its reverse (17416521), we get a palindrome (29977992).

The spelling of 12561471 in words is "twelve million, five hundred sixty-one thousand, four hundred seventy-one".