131224042991 has 2 divisors, whose sum is σ = 131224042992. Its totient is φ = 131224042990.

The previous prime is 131224042919. The next prime is 131224042993. The reversal of 131224042991 is 199240422131.

Together with previous prime (131224042919) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131224042991 is a prime.

Together with 131224042993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131224042993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65612021495 + 65612021496.

It is an arithmetic number, because the mean of its divisors is an integer number (65612021496).

Almost surely, 2^131224042991 is an apocalyptic number.

131224042991 is a deficient number, since it is larger than the sum of its proper divisors (1).

131224042991 is an equidigital number, since it uses as much as digits as its factorization.

131224042991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 131224042991 in words is "one hundred thirty-one billion, two hundred twenty-four million, forty-two thousand, nine hundred ninety-one".