243205142 has 4 divisors (see below), whose sum is σ = 364807716. Its totient is φ = 121602570.

The previous prime is 243205133. The next prime is 243205147. The reversal of 243205142 is 241502342.

It is a happy number.

243205142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 241502342 = 2 ⋅120751171.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243205147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60801284 + ... + 60801287.

It is an arithmetic number, because the mean of its divisors is an integer number (91201929).

Almost surely, 2^243205142 is an apocalyptic number.

243205142 is a deficient number, since it is larger than the sum of its proper divisors (121602574).

243205142 is a wasteful number, since it uses less digits than its factorization.

243205142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121602573.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 243205142 is about 15595.0358127194. The cubic root of 243205142 is about 624.2006993988.

Adding to 243205142 its reverse (241502342), we get a palindrome (484707484).

The spelling of 243205142 in words is "two hundred forty-three million, two hundred five thousand, one hundred forty-two".