1004255561 has 2 divisors, whose sum is σ = 1004255562. Its totient is φ = 1004255560.

The previous prime is 1004255543. The next prime is 1004255573. The reversal of 1004255561 is 1655524001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999761161 + 4494400 = 31619^2 + 2120^2 .

It is an emirp because it is prime and its reverse (1655524001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1004255561 - 2²⁶ = 937146697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1004225561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502127780 + 502127781.

It is an arithmetic number, because the mean of its divisors is an integer number (502127781).

Almost surely, 2^1004255561 is an apocalyptic number.

It is an amenable number.

1004255561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004255561 is an equidigital number, since it uses as much as digits as its factorization.

1004255561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 1004255561 is about 31689.9914957388. The cubic root of 1004255561 is about 1001.4165128772.

Adding to 1004255561 its reverse (1655524001), we get a palindrome (2659779562).

The spelling of 1004255561 in words is "one billion, four million, two hundred fifty-five thousand, five hundred sixty-one".