251216126 has 16 divisors (see below), whose sum is σ = 444549120. Its totient is φ = 104190840.

The previous prime is 251216101. The next prime is 251216167. The reversal of 251216126 is 621612152.

It is a junction number, because it is equal to n+sod(n) for n = 251216095 and 251216104.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 288986 + ... + 289853.

It is an arithmetic number, because the mean of its divisors is an integer number (27784320).

Almost surely, 2^251216126 is an apocalyptic number.

251216126 is a deficient number, since it is larger than the sum of its proper divisors (193332994).

251216126 is a wasteful number, since it uses less digits than its factorization.

251216126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578879.

The product of its digits is 1440, while the sum is 26.

The square root of 251216126 is about 15849.7989261694. The cubic root of 251216126 is about 630.9803549062.

Adding to 251216126 its reverse (621612152), we get a palindrome (872828278).

The spelling of 251216126 in words is "two hundred fifty-one million, two hundred sixteen thousand, one hundred twenty-six".