12045521 has 2 divisors, whose sum is σ = 12045522. Its totient is φ = 12045520.

The previous prime is 12045497. The next prime is 12045589. The reversal of 12045521 is 12554021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11999296 + 46225 = 3464^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 12045521 - 2⁶ = 12045457 is a prime.

It is a super-2 number, since 2×12045521² = 290189152322882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12045493 and 12045502.

It is not a weakly prime, because it can be changed into another prime (12041521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6022760 + 6022761.

It is an arithmetic number, because the mean of its divisors is an integer number (6022761).

Almost surely, 2^12045521 is an apocalyptic number.

It is an amenable number.

12045521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12045521 is an equidigital number, since it uses as much as digits as its factorization.

12045521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 12045521 is about 3470.6657862721. The cubic root of 12045521 is about 229.2319750982.

Adding to 12045521 its reverse (12554021), we get a palindrome (24599542).

The spelling of 12045521 in words is "twelve million, forty-five thousand, five hundred twenty-one".