12435561 has 12 divisors (see below), whose sum is σ = 17993092.
Its totient is φ = 8276256.
The previous prime is 12435559. The next prime is 12435611. The reversal of 12435561 is 16553421.
Adding to 12435561 its reverse (16553421), we get a palindrome (28988982).
It can be divided in two parts, 12435 and 561, that added together give a square (12996 = 1142).
12435561 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in 2 ways, for example, as 4347225 + 8088336 = 2085^2 + 2844^2
It is not a de Polignac number, because 12435561 - 21 = 12435559 is a prime.
It is a Duffinian number.
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (12435541) 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, 9435 + ... + 10671.
Almost surely, 212435561 is an apocalyptic number.
It is an amenable number.
12435561 is a deficient number, since it is larger than the sum of its proper divisors (5557531).
12435561 is a wasteful number, since it uses less digits than its factorization.
12435561 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2360 (or 2357 counting only the distinct ones).
The product of its digits is 3600, while the sum is 27.
The square root of 12435561 is about 3526.4090800700.
The cubic root of 12435561 is about 231.6799553017.
The spelling of 12435561 in words is "twelve million, four hundred thirty-five thousand, five hundred sixty-one".