12315641 has 4 divisors (see below), whose sum is σ = 13263012. Its totient is φ = 11368272.

The previous prime is 12315631. The next prime is 12315643. The reversal of 12315641 is 14651321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5664400 + 6651241 = 2380^2 + 2579^2 .

It is a cyclic number.

It is not a de Polignac number, because 12315641 - 2⁶ = 12315577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12315643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473666 + ... + 473691.

It is an arithmetic number, because the mean of its divisors is an integer number (3315753).

Almost surely, 2^12315641 is an apocalyptic number.

It is an amenable number.

12315641 is a deficient number, since it is larger than the sum of its proper divisors (947371).

12315641 is an equidigital number, since it uses as much as digits as its factorization.

12315641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947370.

The product of its digits is 720, while the sum is 23.

The square root of 12315641 is about 3509.3647573314. The cubic root of 12315641 is about 230.9328278044.

Adding to 12315641 its reverse (14651321), we get a palindrome (26966962).

The spelling of 12315641 in words is "twelve million, three hundred fifteen thousand, six hundred forty-one".