131130991 has 2 divisors, whose sum is σ = 131130992. Its totient is φ = 131130990.

The previous prime is 131130977. The next prime is 131131001. The reversal of 131130991 is 199031131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131130991 - 2⁵ = 131130959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131130491) 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, 65565495 + 65565496.

It is an arithmetic number, because the mean of its divisors is an integer number (65565496).

Almost surely, 2^131130991 is an apocalyptic number.

131130991 is a deficient number, since it is larger than the sum of its proper divisors (1).

131130991 is an equidigital number, since it uses as much as digits as its factorization.

131130991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 131130991 is about 11451.2440808848. The cubic root of 131130991 is about 508.0445315603.

The spelling of 131130991 in words is "one hundred thirty-one million, one hundred thirty thousand, nine hundred ninety-one".