542144021 has 2 divisors, whose sum is σ = 542144022. Its totient is φ = 542144020.

The previous prime is 542144011. The next prime is 542144041. The reversal of 542144021 is 120441245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 536431921 + 5712100 = 23161^2 + 2390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542144021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542144011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271072010 + 271072011.

It is an arithmetic number, because the mean of its divisors is an integer number (271072011).

Almost surely, 2^542144021 is an apocalyptic number.

It is an amenable number.

542144021 is a deficient number, since it is larger than the sum of its proper divisors (1).

542144021 is an equidigital number, since it uses as much as digits as its factorization.

542144021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 542144021 is about 23283.9863640228. The cubic root of 542144021 is about 815.4015966507.

Adding to 542144021 its reverse (120441245), we get a palindrome (662585266).

The spelling of 542144021 in words is "five hundred forty-two million, one hundred forty-four thousand, twenty-one".