555391 has 2 divisors, whose sum is σ = 555392. Its totient is φ = 555390.

The previous prime is 555383. The next prime is 555419. The reversal of 555391 is 193555.

It is an a-pointer prime, because the next prime (555419) can be obtained adding 555391 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 555391 - 2³ = 555383 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 (555301) 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, 277695 + 277696.

It is an arithmetic number, because the mean of its divisors is an integer number (277696).

2⁵⁵⁵³⁹¹ is an apocalyptic number.

555391 is a deficient number, since it is larger than the sum of its proper divisors (1).

555391 is an equidigital number, since it uses as much as digits as its factorization.

555391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3375, while the sum is 28.

The square root of 555391 is about 745.2455971021. The cubic root of 555391 is about 82.1989517649.

It can be divided in two parts, 555 and 391, that added together give a triangular number (946 = T₄₃).

The spelling of 555391 in words is "five hundred fifty-five thousand, three hundred ninety-one".