542142107809 has 9 divisors (see below), whose sum is σ = 545531638387. Its totient is φ = 538773521584.

The previous prime is 542142107777. The next prime is 542142107813. The reversal of 542142107809 is 908701241245.

The square root of 542142107809 is 736303.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 40764821409 + 501377286400 = 201903^2 + 708080^2 .

It is not a de Polignac number, because 542142107809 - 2⁵ = 542142107777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542142177809) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 122960397 + ... + 122964805.

Almost surely, 2^542142107809 is an apocalyptic number.

542142107809 is the 736303-rd square number.

542142107809 is the 368152-nd centered octagonal number.

It is an amenable number.

542142107809 is a deficient number, since it is larger than the sum of its proper divisors (3389530578).

542142107809 is an frugal number, since it uses more digits than its factorization.

542142107809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9152 (or 4576 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 542142107809 in words is "five hundred forty-two billion, one hundred forty-two million, one hundred seven thousand, eight hundred nine".