542139194 has 4 divisors (see below), whose sum is σ = 813208794. Its totient is φ = 271069596.

The previous prime is 542139193. The next prime is 542139209. The reversal of 542139194 is 491931245.

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

It can be written as a sum of positive squares in only one way, i.e., 464962969 + 77176225 = 21563^2 + 8785^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (542139193) 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, 135534797 + ... + 135534800.

Almost surely, 2^542139194 is an apocalyptic number.

542139194 is a deficient number, since it is larger than the sum of its proper divisors (271069600).

542139194 is a wasteful number, since it uses less digits than its factorization.

542139194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271069599.

The product of its digits is 38880, while the sum is 38.

The square root of 542139194 is about 23283.8827088611. The cubic root of 542139194 is about 815.3991766571.

The spelling of 542139194 in words is "five hundred forty-two million, one hundred thirty-nine thousand, one hundred ninety-four".