131310191 has 2 divisors, whose sum is σ = 131310192. Its totient is φ = 131310190.

The previous prime is 131310187. The next prime is 131310199. The reversal of 131310191 is 191013131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131310191 - 2² = 131310187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131310199) 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, 65655095 + 65655096.

It is an arithmetic number, because the mean of its divisors is an integer number (65655096).

Almost surely, 2^131310191 is an apocalyptic number.

131310191 is a deficient number, since it is larger than the sum of its proper divisors (1).

131310191 is an equidigital number, since it uses as much as digits as its factorization.

131310191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 131310191 is about 11459.0658868862. The cubic root of 131310191 is about 508.2758527737.

The spelling of 131310191 in words is "one hundred thirty-one million, three hundred ten thousand, one hundred ninety-one".