542089787909 has 2 divisors, whose sum is σ = 542089787910. Its totient is φ = 542089787908.

The previous prime is 542089787893. The next prime is 542089787927. The reversal of 542089787909 is 909787980245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538301016100 + 3788771809 = 733690^2 + 61553^2 .

It is a cyclic number.

It is not a de Polignac number, because 542089787909 - 2⁴ = 542089787893 is a prime.

It is a super-2 number, since 2×542089787909² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542089787969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271044893954 + 271044893955.

It is an arithmetic number, because the mean of its divisors is an integer number (271044893955).

Almost surely, 2^542089787909 is an apocalyptic number.

It is an amenable number.

542089787909 is a deficient number, since it is larger than the sum of its proper divisors (1).

542089787909 is an equidigital number, since it uses as much as digits as its factorization.

542089787909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91445760, while the sum is 68.

The spelling of 542089787909 in words is "five hundred forty-two billion, eighty-nine million, seven hundred eighty-seven thousand, nine hundred nine".