251271717132 has 24 divisors (see below), whose sum is σ = 586423285056. Its totient is φ = 83739723088.

The previous prime is 251271717107. The next prime is 251271717139. The reversal of 251271717132 is 231717172152.

It is not an unprimeable number, because it can be changed into a prime (251271717139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2129658 + ... + 2244545.

It is an arithmetic number, because the mean of its divisors is an integer number (24434303544).

Almost surely, 2^251271717132 is an apocalyptic number.

It is an amenable number.

251271717132 is an abundant number, since it is smaller than the sum of its proper divisors (335151567924).

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

251271717132 is a wasteful number, since it uses less digits than its factorization.

251271717132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4378997 (or 4378995 counting only the distinct ones).

The product of its digits is 41160, while the sum is 39.

Adding to 251271717132 its reverse (231717172152), we get a palindrome (482988889284).

The spelling of 251271717132 in words is "two hundred fifty-one billion, two hundred seventy-one million, seven hundred seventeen thousand, one hundred thirty-two".