131224144 has 10 divisors (see below), whose sum is σ = 254246810. Its totient is φ = 65612064.

The previous prime is 131224097. The next prime is 131224157. The reversal of 131224144 is 441422131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 129686544 + 1537600 = 11388^2 + 1240^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4100739 + ... + 4100770.

It is an arithmetic number, because the mean of its divisors is an integer number (25424681).

Almost surely, 2^131224144 is an apocalyptic number.

It is an amenable number.

131224144 is a deficient number, since it is larger than the sum of its proper divisors (123022666).

131224144 is an equidigital number, since it uses as much as digits as its factorization.

131224144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8201517 (or 8201511 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 131224144 is about 11455.3107334546. The cubic root of 131224144 is about 508.1648048581.

Adding to 131224144 its reverse (441422131), we get a palindrome (572646275).

The spelling of 131224144 in words is "one hundred thirty-one million, two hundred twenty-four thousand, one hundred forty-four".