19555061 has 2 divisors, whose sum is σ = 19555062. Its totient is φ = 19555060.

The previous prime is 19555051. The next prime is 19555069. The reversal of 19555061 is 16055591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12292036 + 7263025 = 3506^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 19555061 - 2¹⁰ = 19554037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19555069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9777530 + 9777531.

It is an arithmetic number, because the mean of its divisors is an integer number (9777531).

Almost surely, 2^19555061 is an apocalyptic number.

It is an amenable number.

19555061 is a deficient number, since it is larger than the sum of its proper divisors (1).

19555061 is an equidigital number, since it uses as much as digits as its factorization.

19555061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 19555061 is about 4422.1104689955. The cubic root of 19555061 is about 269.4137301992.

The spelling of 19555061 in words is "nineteen million, five hundred fifty-five thousand, sixty-one".