12017561 has 2 divisors, whose sum is σ = 12017562. Its totient is φ = 12017560.

The previous prime is 12017539. The next prime is 12017567. The reversal of 12017561 is 16571021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9859600 + 2157961 = 3140^2 + 1469^2 .

It is a cyclic number.

It is not a de Polignac number, because 12017561 - 2⁶ = 12017497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12017567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6008780 + 6008781.

It is an arithmetic number, because the mean of its divisors is an integer number (6008781).

Almost surely, 2^12017561 is an apocalyptic number.

It is an amenable number.

12017561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12017561 is an equidigital number, since it uses as much as digits as its factorization.

12017561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 12017561 is about 3466.6354005000. The cubic root of 12017561 is about 229.0544736704.

Adding to 12017561 its reverse (16571021), we get a palindrome (28588582).

The spelling of 12017561 in words is "twelve million, seventeen thousand, five hundred sixty-one".