131224521 has 4 divisors (see below), whose sum is σ = 174966032. Its totient is φ = 87483012.

The previous prime is 131224463. The next prime is 131224523. The reversal of 131224521 is 125422131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 131224521 - 2¹⁴ = 131208137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131224523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21870751 + ... + 21870756.

It is an arithmetic number, because the mean of its divisors is an integer number (43741508).

Almost surely, 2^131224521 is an apocalyptic number.

It is an amenable number.

131224521 is a deficient number, since it is larger than the sum of its proper divisors (43741511).

131224521 is an equidigital number, since it uses as much as digits as its factorization.

131224521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43741510.

The product of its digits is 480, while the sum is 21.

The square root of 131224521 is about 11455.3271886926. The cubic root of 131224521 is about 508.1652915011.

Adding to 131224521 its reverse (125422131), we get a palindrome (256646652).

The spelling of 131224521 in words is "one hundred thirty-one million, two hundred twenty-four thousand, five hundred twenty-one".