251972250 has 64 divisors (see below), whose sum is σ = 633709440. Its totient is φ = 66681600.

The previous prime is 251972239. The next prime is 251972263. The reversal of 251972250 is 52279152.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103042 + ... + 105458.

It is an arithmetic number, because the mean of its divisors is an integer number (9901710).

Almost surely, 2^251972250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251972250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316854720).

251972250 is an abundant number, since it is smaller than the sum of its proper divisors (381737190).

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

251972250 is a wasteful number, since it uses less digits than its factorization.

251972250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576 (or 2566 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 251972250 is about 15873.6337994802. The cubic root of 251972250 is about 631.6127738644.

The spelling of 251972250 in words is "two hundred fifty-one million, nine hundred seventy-two thousand, two hundred fifty".