12315561 has 8 divisors (see below), whose sum is σ = 16864704. Its totient is φ = 7988400.

The previous prime is 12315559. The next prime is 12315577. The reversal of 12315561 is 16551321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12315561 - 2¹ = 12315559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12315521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55365 + ... + 55586.

It is an arithmetic number, because the mean of its divisors is an integer number (2108088).

Almost surely, 2^12315561 is an apocalyptic number.

It is an amenable number.

12315561 is a deficient number, since it is larger than the sum of its proper divisors (4549143).

12315561 is a wasteful number, since it uses less digits than its factorization.

12315561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110991.

The product of its digits is 900, while the sum is 24.

The square root of 12315561 is about 3509.3533592387. The cubic root of 12315561 is about 230.9323277718.

Adding to 12315561 its reverse (16551321), we get a palindrome (28866882).

The spelling of 12315561 in words is "twelve million, three hundred fifteen thousand, five hundred sixty-one".