555591961 has 2 divisors, whose sum is σ = 555591962. Its totient is φ = 555591960.

The previous prime is 555591913. The next prime is 555591997. The reversal of 555591961 is 169195555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 536617225 + 18974736 = 23165^2 + 4356^2 .

It is a cyclic number.

It is not a de Polignac number, because 555591961 - 2⁷ = 555591833 is a prime.

It is not a weakly prime, because it can be changed into another prime (555591461) 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, 277795980 + 277795981.

It is an arithmetic number, because the mean of its divisors is an integer number (277795981).

Almost surely, 2^555591961 is an apocalyptic number.

It is an amenable number.

555591961 is a deficient number, since it is larger than the sum of its proper divisors (1).

555591961 is an equidigital number, since it uses as much as digits as its factorization.

555591961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 303750, while the sum is 46.

The square root of 555591961 is about 23570.9983029994. The cubic root of 555591961 is about 822.0886477606.

The spelling of 555591961 in words is "five hundred fifty-five million, five hundred ninety-one thousand, nine hundred sixty-one".