542396809 has 2 divisors, whose sum is σ = 542396810. Its totient is φ = 542396808.

The previous prime is 542396719. The next prime is 542396851. The reversal of 542396809 is 908693245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 521894025 + 20502784 = 22845^2 + 4528^2 .

It is a cyclic number.

It is not a de Polignac number, because 542396809 - 2²¹ = 540299657 is a prime.

It is not a weakly prime, because it can be changed into another prime (542396609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271198404 + 271198405.

It is an arithmetic number, because the mean of its divisors is an integer number (271198405).

Almost surely, 2^542396809 is an apocalyptic number.

It is an amenable number.

542396809 is a deficient number, since it is larger than the sum of its proper divisors (1).

542396809 is an equidigital number, since it uses as much as digits as its factorization.

542396809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 542396809 is about 23289.4140973963. The cubic root of 542396809 is about 815.5283106494.

The spelling of 542396809 in words is "five hundred forty-two million, three hundred ninety-six thousand, eight hundred nine".