251130330 has 192 divisors, whose sum is σ = 764225280. Its totient is φ = 56601600.

The previous prime is 251130317. The next prime is 251130367. The reversal of 251130330 is 33031152.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 933436 + ... + 933704.

It is an arithmetic number, because the mean of its divisors is an integer number (3980340).

Almost surely, 2^251130330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251130330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382112640).

251130330 is an abundant number, since it is smaller than the sum of its proper divisors (513094950).

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

251130330 is a wasteful number, since it uses less digits than its factorization.

251130330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 251130330 is about 15847.0921622864. The cubic root of 251130330 is about 630.9085153639.

Adding to 251130330 its reverse (33031152), we get a palindrome (284161482).

The spelling of 251130330 in words is "two hundred fifty-one million, one hundred thirty thousand, three hundred thirty".