251004242 has 4 divisors (see below), whose sum is σ = 376506366. Its totient is φ = 125502120.

The previous prime is 251004239. The next prime is 251004277. The reversal of 251004242 is 242400152.

It is a happy number.

251004242 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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., 250873921 + 130321 = 15839^2 + 361^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62751059 + ... + 62751062.

Almost surely, 2^251004242 is an apocalyptic number.

251004242 is a deficient number, since it is larger than the sum of its proper divisors (125502124).

251004242 is a wasteful number, since it uses less digits than its factorization.

251004242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125502123.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 251004242 is about 15843.1133935221. The cubic root of 251004242 is about 630.8029084331.

Adding to 251004242 its reverse (242400152), we get a palindrome (493404394).

The spelling of 251004242 in words is "two hundred fifty-one million, four thousand, two hundred forty-two".