542555581 has 2 divisors, whose sum is σ = 542555582. Its totient is φ = 542555580.

The previous prime is 542555549. The next prime is 542555593. The reversal of 542555581 is 185555245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271953081 + 270602500 = 16491^2 + 16450^2 .

It is a cyclic number.

It is not a de Polignac number, because 542555581 - 2⁵ = 542555549 is a prime.

It is a super-2 number, since 2×542555581² = 588733116948495122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542558581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271277790 + 271277791.

It is an arithmetic number, because the mean of its divisors is an integer number (271277791).

Almost surely, 2^542555581 is an apocalyptic number.

It is an amenable number.

542555581 is a deficient number, since it is larger than the sum of its proper divisors (1).

542555581 is an equidigital number, since it uses as much as digits as its factorization.

542555581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 200000, while the sum is 40.

The square root of 542555581 is about 23292.8225211115. The cubic root of 542555581 is about 815.6078775069.

The spelling of 542555581 in words is "five hundred forty-two million, five hundred fifty-five thousand, five hundred eighty-one".