131171558991 has 12 divisors (see below), whose sum is σ = 192240412056. Its totient is φ = 79497914320.

The previous prime is 131171558989. The next prime is 131171558993. The reversal of 131171558991 is 199855171131.

It is an interprime number because it is at equal distance from previous prime (131171558989) and next prime (131171558993).

It is not a de Polignac number, because 131171558991 - 2¹ = 131171558989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131171558993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180676716 + ... + 180677441.

It is an arithmetic number, because the mean of its divisors is an integer number (16020034338).

Almost surely, 2^131171558991 is an apocalyptic number.

131171558991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131171558991 is a deficient number, since it is larger than the sum of its proper divisors (61068853065).

131171558991 is a wasteful number, since it uses less digits than its factorization.

131171558991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361354182 (or 361354171 counting only the distinct ones).

The product of its digits is 340200, while the sum is 51.

The spelling of 131171558991 in words is "one hundred thirty-one billion, one hundred seventy-one million, five hundred fifty-eight thousand, nine hundred ninety-one".