131242140109 has 2 divisors, whose sum is σ = 131242140110. Its totient is φ = 131242140108.

The previous prime is 131242140077. The next prime is 131242140173. The reversal of 131242140109 is 901041242131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126533161225 + 4708978884 = 355715^2 + 68622^2 .

It is an emirp because it is prime and its reverse (901041242131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131242140109 - 2⁵ = 131242140077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131242140179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65621070054 + 65621070055.

It is an arithmetic number, because the mean of its divisors is an integer number (65621070055).

Almost surely, 2^131242140109 is an apocalyptic number.

It is an amenable number.

131242140109 is a deficient number, since it is larger than the sum of its proper divisors (1).

131242140109 is an equidigital number, since it uses as much as digits as its factorization.

131242140109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 131242140109 in words is "one hundred thirty-one billion, two hundred forty-two million, one hundred forty thousand, one hundred nine".