251340212 has 6 divisors (see below), whose sum is σ = 439845378. Its totient is φ = 125670104.

The previous prime is 251340211. The next prime is 251340253. The reversal of 251340212 is 212043152.

It can be written as a sum of positive squares in only one way, i.e., 214446736 + 36893476 = 14644^2 + 6074^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251340211) 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 as a sum of consecutive naturals, namely, 31417523 + ... + 31417530.

It is an arithmetic number, because the mean of its divisors is an integer number (73307563).

Almost surely, 2^251340212 is an apocalyptic number.

It is an amenable number.

251340212 is a deficient number, since it is larger than the sum of its proper divisors (188505166).

251340212 is a wasteful number, since it uses less digits than its factorization.

251340212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62835057 (or 62835055 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 251340212 is about 15853.7128774303. The cubic root of 251340212 is about 631.0842268748.

Adding to 251340212 its reverse (212043152), we get a palindrome (463383364).

The spelling of 251340212 in words is "two hundred fifty-one million, three hundred forty thousand, two hundred twelve".