542578781 has 2 divisors, whose sum is σ = 542578782. Its totient is φ = 542578780.

The previous prime is 542578747. The next prime is 542578807. The reversal of 542578781 is 187875245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413756281 + 128822500 = 20341^2 + 11350^2 .

It is a cyclic number.

It is not a de Polignac number, because 542578781 - 2¹⁸ = 542316637 is a prime.

It is a super-2 number, since 2×542578781² = 588783467182891922, which contains 22 as substring.

It is equal to p_28476488 and since 542578781 and 28476488 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542578711) 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, 271289390 + 271289391.

It is an arithmetic number, because the mean of its divisors is an integer number (271289391).

Almost surely, 2^542578781 is an apocalyptic number.

It is an amenable number.

542578781 is a deficient number, since it is larger than the sum of its proper divisors (1).

542578781 is an equidigital number, since it uses as much as digits as its factorization.

542578781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 627200, while the sum is 47.

The square root of 542578781 is about 23293.3205232745. The cubic root of 542578781 is about 815.6195026342.

The spelling of 542578781 in words is "five hundred forty-two million, five hundred seventy-eight thousand, seven hundred eighty-one".