131737993909 has 2 divisors, whose sum is σ = 131737993910. Its totient is φ = 131737993908.

The previous prime is 131737993867. The next prime is 131737993943. The reversal of 131737993909 is 909399737131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109708013284 + 22029980625 = 331222^2 + 148425^2 .

It is an emirp because it is prime and its reverse (909399737131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131737993909 - 2¹⁹ = 131737469621 is a prime.

It is a super-2 number, since 2×131737993909² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131737993969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65868996954 + 65868996955.

It is an arithmetic number, because the mean of its divisors is an integer number (65868996955).

Almost surely, 2^131737993909 is an apocalyptic number.

It is an amenable number.

131737993909 is a deficient number, since it is larger than the sum of its proper divisors (1).

131737993909 is an equidigital number, since it uses as much as digits as its factorization.

131737993909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8680203, while the sum is 61.

The spelling of 131737993909 in words is "one hundred thirty-one billion, seven hundred thirty-seven million, nine hundred ninety-three thousand, nine hundred nine".