131995086991 has 2 divisors, whose sum is σ = 131995086992. Its totient is φ = 131995086990.

The previous prime is 131995086973. The next prime is 131995087031. The reversal of 131995086991 is 199680599131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131995086991 - 2⁹ = 131995086479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131995086931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65997543495 + 65997543496.

It is an arithmetic number, because the mean of its divisors is an integer number (65997543496).

Almost surely, 2^131995086991 is an apocalyptic number.

131995086991 is a deficient number, since it is larger than the sum of its proper divisors (1).

131995086991 is an equidigital number, since it uses as much as digits as its factorization.

131995086991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4723920, while the sum is 61.

The spelling of 131995086991 in words is "one hundred thirty-one billion, nine hundred ninety-five million, eighty-six thousand, nine hundred ninety-one".