131530961 has 2 divisors, whose sum is σ = 131530962. Its totient is φ = 131530960.

The previous prime is 131530879. The next prime is 131530969. The reversal of 131530961 is 169035131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74995600 + 56535361 = 8660^2 + 7519^2 .

It is a cyclic number.

It is not a de Polignac number, because 131530961 - 2²⁶ = 64422097 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131530969) 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, 65765480 + 65765481.

It is an arithmetic number, because the mean of its divisors is an integer number (65765481).

Almost surely, 2^131530961 is an apocalyptic number.

It is an amenable number.

131530961 is a deficient number, since it is larger than the sum of its proper divisors (1).

131530961 is an equidigital number, since it uses as much as digits as its factorization.

131530961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 131530961 is about 11468.6948254804. The cubic root of 131530961 is about 508.5605456600.

The spelling of 131530961 in words is "one hundred thirty-one million, five hundred thirty thousand, nine hundred sixty-one".