131225321 has 2 divisors, whose sum is σ = 131225322. Its totient is φ = 131225320.

The previous prime is 131225317. The next prime is 131225323. The reversal of 131225321 is 123522131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129163225 + 2062096 = 11365^2 + 1436^2 .

It is a cyclic number.

It is not a de Polignac number, because 131225321 - 2² = 131225317 is a prime.

Together with 131225323, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 131225293 and 131225302.

It is not a weakly prime, because it can be changed into another prime (131225323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65612660 + 65612661.

It is an arithmetic number, because the mean of its divisors is an integer number (65612661).

Almost surely, 2^131225321 is an apocalyptic number.

It is an amenable number.

131225321 is a deficient number, since it is larger than the sum of its proper divisors (1).

131225321 is an equidigital number, since it uses as much as digits as its factorization.

131225321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 131225321 is about 11455.3621068913. The cubic root of 131225321 is about 508.1663241623.

Adding to 131225321 its reverse (123522131), we get a palindrome (254747452).

The spelling of 131225321 in words is "one hundred thirty-one million, two hundred twenty-five thousand, three hundred twenty-one".