251790222 has 16 divisors (see below), whose sum is σ = 509955840. Its totient is φ = 82867512.

The previous prime is 251790199. The next prime is 251790239. The reversal of 251790222 is 222097152.

It is a self number, because there is not a number n which added to its sum of digits gives 251790222.

It is a congruent number.

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, 265128 + ... + 266075.

It is an arithmetic number, because the mean of its divisors is an integer number (31872240).

Almost surely, 2^251790222 is an apocalyptic number.

251790222 is an abundant number, since it is smaller than the sum of its proper divisors (258165618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251790222 is a wasteful number, since it uses less digits than its factorization.

251790222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531287.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 251790222 is about 15867.8991047965. The cubic root of 251790222 is about 631.4606421559.

The spelling of 251790222 in words is "two hundred fifty-one million, seven hundred ninety thousand, two hundred twenty-two".