5561381851 has 2 divisors, whose sum is σ = 5561381852. Its totient is φ = 5561381850.

The previous prime is 5561381827. The next prime is 5561381857. The reversal of 5561381851 is 1581831655.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5561381851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5561381798 and 5561381807.

It is not a weakly prime, because it can be changed into another prime (5561381857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780690925 + 2780690926.

It is an arithmetic number, because the mean of its divisors is an integer number (2780690926).

Almost surely, 2^5561381851 is an apocalyptic number.

5561381851 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561381851 is an equidigital number, since it uses as much as digits as its factorization.

5561381851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144000, while the sum is 43.

The square root of 5561381851 is about 74574.6729862089. The cubic root of 5561381851 is about 1771.7165352722.

The spelling of 5561381851 in words is "five billion, five hundred sixty-one million, three hundred eighty-one thousand, eight hundred fifty-one".