1004120561 has 2 divisors, whose sum is σ = 1004120562. Its totient is φ = 1004120560.

The previous prime is 1004120527. The next prime is 1004120567. The reversal of 1004120561 is 1650214001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 885419536 + 118701025 = 29756^2 + 10895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004120561 - 2⁶ = 1004120497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1004120567) 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, 502060280 + 502060281.

It is an arithmetic number, because the mean of its divisors is an integer number (502060281).

Almost surely, 2^1004120561 is an apocalyptic number.

It is an amenable number.

1004120561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004120561 is an equidigital number, since it uses as much as digits as its factorization.

1004120561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1004120561 is about 31687.8614141125. The cubic root of 1004120561 is about 1001.3716380821.

Adding to 1004120561 its reverse (1650214001), we get a palindrome (2654334562).

The spelling of 1004120561 in words is "one billion, four million, one hundred twenty thousand, five hundred sixty-one".