131991226349 has 2 divisors, whose sum is σ = 131991226350. Its totient is φ = 131991226348.

The previous prime is 131991226327. The next prime is 131991226399. The reversal of 131991226349 is 943622199131.

It is an a-pointer prime, because the next prime (131991226399) can be obtained adding 131991226349 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123564904324 + 8426322025 = 351518^2 + 91795^2 .

It is a cyclic number.

It is not a de Polignac number, because 131991226349 - 2⁸ = 131991226093 is a prime.

It is a super-2 number, since 2×131991226349² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131991226297 and 131991226306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131991226399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65995613174 + 65995613175.

It is an arithmetic number, because the mean of its divisors is an integer number (65995613175).

Almost surely, 2^131991226349 is an apocalyptic number.

It is an amenable number.

131991226349 is a deficient number, since it is larger than the sum of its proper divisors (1).

131991226349 is an equidigital number, since it uses as much as digits as its factorization.

131991226349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 50.

The spelling of 131991226349 in words is "one hundred thirty-one billion, nine hundred ninety-one million, two hundred twenty-six thousand, three hundred forty-nine".