251312314422 has 64 divisors (see below), whose sum is σ = 549545762304. Its totient is φ = 76147948800.

The previous prime is 251312314417. The next prime is 251312314439. The reversal of 251312314422 is 224413213152.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 251312314422.

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 31 ways as a sum of consecutive naturals, for example, 21948703 + ... + 21960149.

It is an arithmetic number, because the mean of its divisors is an integer number (8586652536).

Almost surely, 2^251312314422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251312314422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274772881152).

251312314422 is an abundant number, since it is smaller than the sum of its proper divisors (298233447882).

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

251312314422 is a wasteful number, since it uses less digits than its factorization.

251312314422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15733.

The product of its digits is 11520, while the sum is 30.

Adding to 251312314422 its reverse (224413213152), we get a palindrome (475725527574).

The spelling of 251312314422 in words is "two hundred fifty-one billion, three hundred twelve million, three hundred fourteen thousand, four hundred twenty-two".