251271222 has 8 divisors (see below), whose sum is σ = 502542456. Its totient is φ = 83757072.

The previous prime is 251271221. The next prime is 251271227. The reversal of 251271222 is 222172152.

It is a sphenic number, since it is the product of 3 distinct primes.

251271222 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 251271192 and 251271201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251271221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20939263 + ... + 20939274.

It is an arithmetic number, because the mean of its divisors is an integer number (62817807).

Almost surely, 2^251271222 is an apocalyptic number.

251271222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

251271222 is a wasteful number, since it uses less digits than its factorization.

251271222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41878542.

The product of its digits is 1120, while the sum is 24.

The square root of 251271222 is about 15851.5368970961. The cubic root of 251271222 is about 631.0264798014.

The spelling of 251271222 in words is "two hundred fifty-one million, two hundred seventy-one thousand, two hundred twenty-two".