131971947309 has 6 divisors (see below), whose sum is σ = 190626146126. Its totient is φ = 87981298200.

The previous prime is 131971947301. The next prime is 131971947313. The reversal of 131971947309 is 903749179131.

131971947309 is a `hidden beast` number, since 1 + 319 + 7 + 19 + 4 + 7 + 309 = 666.

It can be written as a sum of positive squares in only one way, i.e., 118580366025 + 13391581284 = 344355^2 + 115722^2 .

It is not a de Polignac number, because 131971947309 - 2³ = 131971947301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131971947301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7331774842 + ... + 7331774859.

Almost surely, 2^131971947309 is an apocalyptic number.

It is an amenable number.

131971947309 is a deficient number, since it is larger than the sum of its proper divisors (58654198817).

131971947309 is a wasteful number, since it uses less digits than its factorization.

131971947309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14663549707 (or 14663549704 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

The spelling of 131971947309 in words is "one hundred thirty-one billion, nine hundred seventy-one million, nine hundred forty-seven thousand, three hundred nine".