251240130 has 48 divisors (see below), whose sum is σ = 677424384. Its totient is φ = 66996720.

The previous prime is 251240123. The next prime is 251240131. The reversal of 251240130 is 31042152.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251240131) 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 23 ways as a sum of consecutive naturals, for example, 49266 + ... + 54125.

It is an arithmetic number, because the mean of its divisors is an integer number (14113008).

Almost surely, 2^251240130 is an apocalyptic number.

251240130 is an abundant number, since it is smaller than the sum of its proper divisors (426184254).

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

251240130 is a wasteful number, since it uses less digits than its factorization.

251240130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103413 (or 103401 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 251240130 is about 15850.5561416627. The cubic root of 251240130 is about 631.0004512409. Note that the first 3 decimals are identical.

Adding to 251240130 its reverse (31042152), we get a palindrome (282282282).

The spelling of 251240130 in words is "two hundred fifty-one million, two hundred forty thousand, one hundred thirty".