542634221 has 4 divisors (see below), whose sum is σ = 555869244. Its totient is φ = 529399200.

The previous prime is 542634217. The next prime is 542634227. The reversal of 542634221 is 122436245.

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 295358596 + 247275625 = 17186^2 + 15725^2 .

It is a cyclic number.

It is not a de Polignac number, because 542634221 - 2² = 542634217 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 (542634227) 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, 6617450 + ... + 6617531.

It is an arithmetic number, because the mean of its divisors is an integer number (138967311).

Almost surely, 2^542634221 is an apocalyptic number.

It is an amenable number.

542634221 is a deficient number, since it is larger than the sum of its proper divisors (13235023).

542634221 is a wasteful number, since it uses less digits than its factorization.

542634221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13235022.

The product of its digits is 11520, while the sum is 29.

The square root of 542634221 is about 23294.5105336000. The cubic root of 542634221 is about 815.6472813377.

The spelling of 542634221 in words is "five hundred forty-two million, six hundred thirty-four thousand, two hundred twenty-one".