251642216 has 32 divisors (see below), whose sum is σ = 540181440. Its totient is φ = 107657088.

The previous prime is 251642197. The next prime is 251642219. The reversal of 251642216 is 612246152.

It is not an unprimeable number, because it can be changed into a prime (251642219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30911 + ... + 38193.

It is an arithmetic number, because the mean of its divisors is an integer number (16880670).

Almost surely, 2^251642216 is an apocalyptic number.

It is an amenable number.

251642216 is an abundant number, since it is smaller than the sum of its proper divisors (288539224).

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

251642216 is a wasteful number, since it uses less digits than its factorization.

251642216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7913 (or 7909 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 251642216 is about 15863.2347268771. The cubic root of 251642216 is about 631.3368906173.

Adding to 251642216 its reverse (612246152), we get a palindrome (863888368).

The spelling of 251642216 in words is "two hundred fifty-one million, six hundred forty-two thousand, two hundred sixteen".