542612221 has 4 divisors (see below), whose sum is σ = 542660092. Its totient is φ = 542564352.

The previous prime is 542612219. The next prime is 542612233. The reversal of 542612221 is 122216245.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 442892025 + 99720196 = 21045^2 + 9986^2 .

It is a cyclic number.

It is not a de Polignac number, because 542612221 - 2¹ = 542612219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542615221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3715 + ... + 33151.

It is an arithmetic number, because the mean of its divisors is an integer number (135665023).

Almost surely, 2^542612221 is an apocalyptic number.

It is an amenable number.

542612221 is a deficient number, since it is larger than the sum of its proper divisors (47871).

542612221 is a wasteful number, since it uses less digits than its factorization.

542612221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47870.

The product of its digits is 1920, while the sum is 25.

The square root of 542612221 is about 23294.0383145559. The cubic root of 542612221 is about 815.6362582691.

Adding to 542612221 its reverse (122216245), we get a palindrome (664828466).

The spelling of 542612221 in words is "five hundred forty-two million, six hundred twelve thousand, two hundred twenty-one".