642600242 has 4 divisors (see below), whose sum is σ = 963900366. Its totient is φ = 321300120.

The previous prime is 642600229. The next prime is 642600251. The reversal of 642600242 is 242006246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242006246 = 2 ⋅121003123.

It can be written as a sum of positive squares in only one way, i.e., 526197721 + 116402521 = 22939^2 + 10789^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160650059 + ... + 160650062.

Almost surely, 2^642600242 is an apocalyptic number.

642600242 is a deficient number, since it is larger than the sum of its proper divisors (321300124).

642600242 is a wasteful number, since it uses less digits than its factorization.

642600242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321300123.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 642600242 is about 25349.5609823918. The cubic root of 642600242 is about 862.9393930603.

Adding to 642600242 its reverse (242006246), we get a palindrome (884606488).

The spelling of 642600242 in words is "six hundred forty-two million, six hundred thousand, two hundred forty-two".