542431221809 has 2 divisors, whose sum is σ = 542431221810. Its totient is φ = 542431221808.

The previous prime is 542431221733. The next prime is 542431221821. The reversal of 542431221809 is 908122134245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530052434209 + 12378787600 = 728047^2 + 111260^2 .

It is a cyclic number.

It is not a de Polignac number, because 542431221809 - 2¹⁶ = 542431156273 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (542431221889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271215610904 + 271215610905.

It is an arithmetic number, because the mean of its divisors is an integer number (271215610905).

Almost surely, 2^542431221809 is an apocalyptic number.

It is an amenable number.

542431221809 is a deficient number, since it is larger than the sum of its proper divisors (1).

542431221809 is an equidigital number, since it uses as much as digits as its factorization.

542431221809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 542431221809 in words is "five hundred forty-two billion, four hundred thirty-one million, two hundred twenty-one thousand, eight hundred nine".