131240521 has 2 divisors, whose sum is σ = 131240522. Its totient is φ = 131240520.

The previous prime is 131240491. The next prime is 131240533. The reversal of 131240521 is 125042131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67815225 + 63425296 = 8235^2 + 7964^2 .

It is a cyclic number.

It is not a de Polignac number, because 131240521 - 2⁷ = 131240393 is a prime.

It is not a weakly prime, because it can be changed into another prime (131240821) 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, 65620260 + 65620261.

It is an arithmetic number, because the mean of its divisors is an integer number (65620261).

Almost surely, 2^131240521 is an apocalyptic number.

It is an amenable number.

131240521 is a deficient number, since it is larger than the sum of its proper divisors (1).

131240521 is an equidigital number, since it uses as much as digits as its factorization.

131240521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 131240521 is about 11456.0255324436. The cubic root of 131240521 is about 508.1859439274.

Adding to 131240521 its reverse (125042131), we get a palindrome (256282652).

The spelling of 131240521 in words is "one hundred thirty-one million, two hundred forty thousand, five hundred twenty-one".