251304242 has 12 divisors (see below), whose sum is σ = 438500430. Its totient is φ = 107701776.

The previous prime is 251304223. The next prime is 251304281. The reversal of 251304242 is 242403152.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 171898321 + 79405921 = 13111^2 + 8911^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1282067 + ... + 1282262.

Almost surely, 2^251304242 is an apocalyptic number.

251304242 is a deficient number, since it is larger than the sum of its proper divisors (187196188).

251304242 is a wasteful number, since it uses less digits than its factorization.

251304242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564345 (or 2564338 counting only the distinct ones).

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

The square root of 251304242 is about 15852.5784022663. The cubic root of 251304242 is about 631.0541200296.

Adding to 251304242 its reverse (242403152), we get a palindrome (493707394).

The spelling of 251304242 in words is "two hundred fifty-one million, three hundred four thousand, two hundred forty-two".