251261602122 has 32 divisors (see below), whose sum is σ = 510920366400. Its totient is φ = 82358736768.

The previous prime is 251261602121. The next prime is 251261602129. The reversal of 251261602122 is 221206162152.

It is a self number, because there is not a number n which added to its sum of digits gives 251261602122.

It is not an unprimeable number, because it can be changed into a prime (251261602121) 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 in 15 ways as a sum of consecutive naturals, for example, 320497 + ... + 777972.

It is an arithmetic number, because the mean of its divisors is an integer number (15966261450).

Almost surely, 2^251261602122 is an apocalyptic number.

251261602122 is an abundant number, since it is smaller than the sum of its proper divisors (259658764278).

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

251261602122 is a wasteful number, since it uses less digits than its factorization.

251261602122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099110.

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 251261602122 its reverse (221206162152), we get a palindrome (472467764274).

The spelling of 251261602122 in words is "two hundred fifty-one billion, two hundred sixty-one million, six hundred two thousand, one hundred twenty-two".