1204561 has 2 divisors, whose sum is σ = 1204562. Its totient is φ = 1204560.

The previous prime is 1204529. The next prime is 1204583. The reversal of 1204561 is 1654021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 844561 + 360000 = 919^2 + 600^2 .

It is an emirp because it is prime and its reverse (1654021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1204561 - 2⁵ = 1204529 is a prime.

It is a super-3 number, since 3×1204561³ = 5243335514030431443, which contains 333 as substring.

1204561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1202561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602280 + 602281.

It is an arithmetic number, because the mean of its divisors is an integer number (602281).

2^1204561 is an apocalyptic number.

It is an amenable number.

1204561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204561 is an equidigital number, since it uses as much as digits as its factorization.

1204561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1204561 is about 1097.5249427690. The cubic root of 1204561 is about 106.4003196421.

Adding to 1204561 its reverse (1654021), we get a palindrome (2858582).

The spelling of 1204561 in words is "one million, two hundred four thousand, five hundred sixty-one".