251012120 has 16 divisors (see below), whose sum is σ = 564777360. Its totient is φ = 100404832.

The previous prime is 251012119. The next prime is 251012147. The reversal of 251012120 is 21210152.

It is a junction number, because it is equal to n+sod(n) for n = 251012095 and 251012104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3137612 + ... + 3137691.

It is an arithmetic number, because the mean of its divisors is an integer number (35298585).

Almost surely, 2^251012120 is an apocalyptic number.

251012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251012120 is an abundant number, since it is smaller than the sum of its proper divisors (313765240).

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

251012120 is a wasteful number, since it uses less digits than its factorization.

251012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6275314 (or 6275310 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 251012120 is about 15843.3620169458. The cubic root of 251012120 is about 630.8095078081.

Adding to 251012120 its reverse (21210152), we get a palindrome (272222272).

The spelling of 251012120 in words is "two hundred fifty-one million, twelve thousand, one hundred twenty".