542440121 has 4 divisors (see below), whose sum is σ = 551332644. Its totient is φ = 533547600.

The previous prime is 542440117. The next prime is 542440147. The reversal of 542440121 is 121044245.

542440121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87684496 + 454755625 = 9364^2 + 21325^2 .

It is a cyclic number.

It is not a de Polignac number, because 542440121 - 2² = 542440117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (542440111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4446170 + ... + 4446291.

It is an arithmetic number, because the mean of its divisors is an integer number (137833161).

Almost surely, 2^542440121 is an apocalyptic number.

It is an amenable number.

542440121 is a deficient number, since it is larger than the sum of its proper divisors (8892523).

542440121 is an equidigital number, since it uses as much as digits as its factorization.

542440121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8892522.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 542440121 is about 23290.3439433599. The cubic root of 542440121 is about 815.5500175262.

Adding to 542440121 its reverse (121044245), we get a palindrome (663484366).

The spelling of 542440121 in words is "five hundred forty-two million, four hundred forty thousand, one hundred twenty-one".