542288221 has 4 divisors (see below), whose sum is σ = 542357244. Its totient is φ = 542219200.

The previous prime is 542288207. The next prime is 542288251. The reversal of 542288221 is 122882245.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122882245 = 5 ⋅24576449.

It can be written as a sum of positive squares in 2 ways, for example, as 358685721 + 183602500 = 18939^2 + 13550^2 .

It is a cyclic number.

It is not a de Polignac number, because 542288221 - 2²⁷ = 408070493 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 (542288251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20950 + ... + 39031.

It is an arithmetic number, because the mean of its divisors is an integer number (135589311).

Almost surely, 2^542288221 is an apocalyptic number.

It is an amenable number.

542288221 is a deficient number, since it is larger than the sum of its proper divisors (69023).

542288221 is an equidigital number, since it uses as much as digits as its factorization.

542288221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69022.

The product of its digits is 20480, while the sum is 34.

The square root of 542288221 is about 23287.0827069429. The cubic root of 542288221 is about 815.4738840150.

The spelling of 542288221 in words is "five hundred forty-two million, two hundred eighty-eight thousand, two hundred twenty-one".