131212320091 has 2 divisors, whose sum is σ = 131212320092. Its totient is φ = 131212320090.

The previous prime is 131212320089. The next prime is 131212320103. The reversal of 131212320091 is 190023212131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131212320091 - 2¹ = 131212320089 is a prime.

Together with 131212320089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (131212320391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65606160045 + 65606160046.

It is an arithmetic number, because the mean of its divisors is an integer number (65606160046).

Almost surely, 2^131212320091 is an apocalyptic number.

131212320091 is a deficient number, since it is larger than the sum of its proper divisors (1).

131212320091 is an equidigital number, since it uses as much as digits as its factorization.

131212320091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 131212320091 in words is "one hundred thirty-one billion, two hundred twelve million, three hundred twenty thousand, ninety-one".