251250000 has 160 divisors (see below), whose sum is σ = 823435392. Its totient is φ = 66000000.

The previous prime is 251249969. The next prime is 251250001. The reversal of 251250000 is 52152.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251250001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3749967 + ... + 3750033.

Almost surely, 2^251250000 is an apocalyptic number.

251250000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411717696).

251250000 is an abundant number, since it is smaller than the sum of its proper divisors (572185392).

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

251250000 is an frugal number, since it uses more digits than its factorization.

251250000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 251250000 is about 15850.8674841474. The cubic root of 251250000 is about 631.0087141100.

The spelling of 251250000 in words is "two hundred fifty-one million, two hundred fifty thousand".