251230520130 has 128 divisors (see below), whose sum is σ = 652367333376. Its totient is φ = 61690137600.

The previous prime is 251230520087. The next prime is 251230520141. The reversal of 251230520130 is 31025032152.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 251230520130.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 4717029 + ... + 4769991.

It is an arithmetic number, because the mean of its divisors is an integer number (5096619792).

Almost surely, 2^251230520130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251230520130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326183666688).

251230520130 is an abundant number, since it is smaller than the sum of its proper divisors (401136813246).

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

251230520130 is a wasteful number, since it uses less digits than its factorization.

251230520130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53192.

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 251230520130 its reverse (31025032152), we get a palindrome (282255552282).

The spelling of 251230520130 in words is "two hundred fifty-one billion, two hundred thirty million, five hundred twenty thousand, one hundred thirty".