131661443 has 2 divisors, whose sum is σ = 131661444. Its totient is φ = 131661442.

The previous prime is 131661401. The next prime is 131661451. The reversal of 131661443 is 344166131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131661443 - 2¹⁶ = 131595907 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131661473) 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, 65830721 + 65830722.

It is an arithmetic number, because the mean of its divisors is an integer number (65830722).

Almost surely, 2^131661443 is an apocalyptic number.

131661443 is a deficient number, since it is larger than the sum of its proper divisors (1).

131661443 is an equidigital number, since it uses as much as digits as its factorization.

131661443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 131661443 is about 11474.3820312904. The cubic root of 131661443 is about 508.7286583380.

The spelling of 131661443 in words is "one hundred thirty-one million, six hundred sixty-one thousand, four hundred forty-three".