131326621 has 2 divisors, whose sum is σ = 131326622. Its totient is φ = 131326620.

The previous prime is 131326603. The next prime is 131326627. The reversal of 131326621 is 126623131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118265625 + 13060996 = 10875^2 + 3614^2 .

It is a cyclic number.

It is not a de Polignac number, because 131326621 - 2⁵ = 131326589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131326627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65663310 + 65663311.

It is an arithmetic number, because the mean of its divisors is an integer number (65663311).

Almost surely, 2^131326621 is an apocalyptic number.

It is an amenable number.

131326621 is a deficient number, since it is larger than the sum of its proper divisors (1).

131326621 is an equidigital number, since it uses as much as digits as its factorization.

131326621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 131326621 is about 11459.7827640841. The cubic root of 131326621 is about 508.2970509862.

Adding to 131326621 its reverse (126623131), we get a palindrome (257949752).

The spelling of 131326621 in words is "one hundred thirty-one million, three hundred twenty-six thousand, six hundred twenty-one".