131225168 has 10 divisors (see below), whose sum is σ = 254248794. Its totient is φ = 65612576.

The previous prime is 131225161. The next prime is 131225179. The reversal of 131225168 is 861522131.

It can be written as a sum of positive squares in only one way, i.e., 129231424 + 1993744 = 11368^2 + 1412^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131225168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131225161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4100771 + ... + 4100802.

Almost surely, 2^131225168 is an apocalyptic number.

It is an amenable number.

131225168 is a deficient number, since it is larger than the sum of its proper divisors (123023626).

131225168 is an equidigital number, since it uses as much as digits as its factorization.

131225168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8201581 (or 8201575 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 131225168 is about 11455.3554287940. The cubic root of 131225168 is about 508.1661266662.

Adding to 131225168 its reverse (861522131), we get a palindrome (992747299).

The spelling of 131225168 in words is "one hundred thirty-one million, two hundred twenty-five thousand, one hundred sixty-eight".