251820130 has 32 divisors (see below), whose sum is σ = 470458368. Its totient is φ = 96945600.

The previous prime is 251820097. The next prime is 251820131. The reversal of 251820130 is 31028152.

It is not an unprimeable number, because it can be changed into a prime (251820131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57084 + ... + 61336.

It is an arithmetic number, because the mean of its divisors is an integer number (14701824).

Almost surely, 2^251820130 is an apocalyptic number.

251820130 is a deficient number, since it is larger than the sum of its proper divisors (218638238).

251820130 is a wasteful number, since it uses less digits than its factorization.

251820130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4482.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 251820130 is about 15868.8414826036. The cubic root of 251820130 is about 631.4856430965.

Adding to 251820130 its reverse (31028152), we get a palindrome (282848282).

The spelling of 251820130 in words is "two hundred fifty-one million, eight hundred twenty thousand, one hundred thirty".