251522012 has 12 divisors (see below), whose sum is σ = 503044080. Its totient is φ = 107795136.

The previous prime is 251521993. The next prime is 251522027. The reversal of 251522012 is 210225152.

It is a happy number.

251522012 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4491437 + ... + 4491492.

It is an arithmetic number, because the mean of its divisors is an integer number (41920340).

Almost surely, 2^251522012 is an apocalyptic number.

It is an amenable number.

251522012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

251522012 is a wasteful number, since it uses less digits than its factorization.

251522012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8982940 (or 8982938 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 251522012 is about 15859.4455136363. The cubic root of 251522012 is about 631.2363493176.

Adding to 251522012 its reverse (210225152), we get a palindrome (461747164).

The spelling of 251522012 in words is "two hundred fifty-one million, five hundred twenty-two thousand, twelve".