251013222 has 32 divisors (see below), whose sum is σ = 566140800. Its totient is φ = 82421064.

The previous prime is 251013173. The next prime is 251013239. The reversal of 251013222 is 222310152.

251013222 is a `hidden beast` number, since 2 + 510 + 132 + 22 = 666.

251013222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 251013195 and 251013204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31072 + ... + 38307.

It is an arithmetic number, because the mean of its divisors is an integer number (17691900).

Almost surely, 2^251013222 is an apocalyptic number.

251013222 is an abundant number, since it is smaller than the sum of its proper divisors (315127578).

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

251013222 is a wasteful number, since it uses less digits than its factorization.

251013222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69457 (or 69451 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 251013222 is about 15843.3967948796. The cubic root of 251013222 is about 630.8104309389.

Adding to 251013222 its reverse (222310152), we get a palindrome (473323374).

The spelling of 251013222 in words is "two hundred fifty-one million, thirteen thousand, two hundred twenty-two".