5561001001 has 2 divisors, whose sum is σ = 5561001002. Its totient is φ = 5561001000.

The previous prime is 5561000993. The next prime is 5561001023. The reversal of 5561001001 is 1001001655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4139635600 + 1421365401 = 64340^2 + 37701^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561001001 - 2³ = 5561000993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5561001001.

It is not a weakly prime, because it can be changed into another prime (5561001091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780500500 + 2780500501.

It is an arithmetic number, because the mean of its divisors is an integer number (2780500501).

Almost surely, 2^5561001001 is an apocalyptic number.

It is an amenable number.

5561001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561001001 is an equidigital number, since it uses as much as digits as its factorization.

5561001001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 5561001001 is about 74572.1194616326. The cubic root of 5561001001 is about 1771.6760912684.

Adding to 5561001001 its reverse (1001001655), we get a palindrome (6562002656).

The spelling of 5561001001 in words is "five billion, five hundred sixty-one million, one thousand, one".