542800861 has 2 divisors, whose sum is σ = 542800862. Its totient is φ = 542800860.

The previous prime is 542800847. The next prime is 542800883. The reversal of 542800861 is 168008245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441798361 + 101002500 = 21019^2 + 10050^2 .

It is a cyclic number.

It is not a de Polignac number, because 542800861 - 2¹³ = 542792669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542800831) 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, 271400430 + 271400431.

It is an arithmetic number, because the mean of its divisors is an integer number (271400431).

Almost surely, 2^542800861 is an apocalyptic number.

It is an amenable number.

542800861 is a deficient number, since it is larger than the sum of its proper divisors (1).

542800861 is an equidigital number, since it uses as much as digits as its factorization.

542800861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 542800861 is about 23298.0870673968. The cubic root of 542800861 is about 815.7307663979.

The spelling of 542800861 in words is "five hundred forty-two million, eight hundred thousand, eight hundred sixty-one".