131081191 has 2 divisors, whose sum is σ = 131081192. Its totient is φ = 131081190.

The previous prime is 131081183. The next prime is 131081207. The reversal of 131081191 is 191180131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131081191 - 2³ = 131081183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131081791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65540595 + 65540596.

It is an arithmetic number, because the mean of its divisors is an integer number (65540596).

Almost surely, 2^131081191 is an apocalyptic number.

131081191 is a deficient number, since it is larger than the sum of its proper divisors (1).

131081191 is an equidigital number, since it uses as much as digits as its factorization.

131081191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 25.

The square root of 131081191 is about 11449.0694381683. The cubic root of 131081191 is about 507.9802095644.

The spelling of 131081191 in words is "one hundred thirty-one million, eighty-one thousand, one hundred ninety-one".