555491 has 2 divisors, whose sum is σ = 555492. Its totient is φ = 555490.

The previous prime is 555487. The next prime is 555521. The reversal of 555491 is 194555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 555491 - 2² = 555487 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (555421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277745 + 277746.

It is an arithmetic number, because the mean of its divisors is an integer number (277746).

2⁵⁵⁵⁴⁹¹ is an apocalyptic number.

555491 is a deficient number, since it is larger than the sum of its proper divisors (1).

555491 is an equidigital number, since it uses as much as digits as its factorization.

555491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500, while the sum is 29.

The square root of 555491 is about 745.3126860587. The cubic root of 555491 is about 82.2038848672.

The spelling of 555491 in words is "five hundred fifty-five thousand, four hundred ninety-one".