231717172152 has 64 divisors (see below), whose sum is σ = 589606087680. Its totient is φ = 75870508032.

The previous prime is 231717172139. The next prime is 231717172199. The reversal of 231717172152 is 251271717132.

It is a super-2 number, since 2×231717172152² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231717172152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 363513 + ... + 771735.

It is an arithmetic number, because the mean of its divisors is an integer number (9212595120).

Almost surely, 2^231717172152 is an apocalyptic number.

It is an amenable number.

231717172152 is an abundant number, since it is smaller than the sum of its proper divisors (357888915528).

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

231717172152 is a wasteful number, since it uses less digits than its factorization.

231717172152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408652 (or 408648 counting only the distinct ones).

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

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

The spelling of 231717172152 in words is "two hundred thirty-one billion, seven hundred seventeen million, one hundred seventy-two thousand, one hundred fifty-two".