12130561 has 4 divisors (see below), whose sum is σ = 12458452. Its totient is φ = 11802672.

The previous prime is 12130553. The next prime is 12130567. The reversal of 12130561 is 16503121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16503121 = 23 ⋅717527.

It can be written as a sum of positive squares in 2 ways, for example, as 4601025 + 7529536 = 2145^2 + 2744^2 .

It is a cyclic number.

It is not a de Polignac number, because 12130561 - 2³ = 12130553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12130567) 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, 163890 + ... + 163963.

It is an arithmetic number, because the mean of its divisors is an integer number (3114613).

Almost surely, 2^12130561 is an apocalyptic number.

It is an amenable number.

12130561 is a deficient number, since it is larger than the sum of its proper divisors (327891).

12130561 is an equidigital number, since it uses as much as digits as its factorization.

12130561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327890.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 12130561 is about 3482.8954908237. The cubic root of 12130561 is about 229.7701610728.

Adding to 12130561 its reverse (16503121), we get a palindrome (28633682).

The spelling of 12130561 in words is "twelve million, one hundred thirty thousand, five hundred sixty-one".