251798242 has 16 divisors (see below), whose sum is σ = 391314240. Its totient is φ = 121373392.

The previous prime is 251798231. The next prime is 251798251. The reversal of 251798242 is 242897152.

It is a junction number, because it is equal to n+sod(n) for n = 251798195 and 251798204.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 40173 + ... + 46015.

It is an arithmetic number, because the mean of its divisors is an integer number (24457140).

Almost surely, 2^251798242 is an apocalyptic number.

251798242 is a deficient number, since it is larger than the sum of its proper divisors (139515998).

251798242 is a wasteful number, since it uses less digits than its factorization.

251798242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6617.

The product of its digits is 80640, while the sum is 40.

The square root of 251798242 is about 15868.1518142473. The cubic root of 251798242 is about 631.4673464943.

The spelling of 251798242 in words is "two hundred fifty-one million, seven hundred ninety-eight thousand, two hundred forty-two".