131972521 has 2 divisors, whose sum is σ = 131972522. Its totient is φ = 131972520.

The previous prime is 131972507. The next prime is 131972527. The reversal of 131972521 is 125279131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115326121 + 16646400 = 10739^2 + 4080^2 .

It is a cyclic number.

It is not a de Polignac number, because 131972521 - 2²³ = 123583913 is a prime.

It is not a weakly prime, because it can be changed into another prime (131972527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65986260 + 65986261.

It is an arithmetic number, because the mean of its divisors is an integer number (65986261).

Almost surely, 2^131972521 is an apocalyptic number.

It is an amenable number.

131972521 is a deficient number, since it is larger than the sum of its proper divisors (1).

131972521 is an equidigital number, since it uses as much as digits as its factorization.

131972521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 31.

The square root of 131972521 is about 11487.9293608552. The cubic root of 131972521 is about 509.1290028806.

The spelling of 131972521 in words is "one hundred thirty-one million, nine hundred seventy-two thousand, five hundred twenty-one".