131865819771 has 24 divisors (see below), whose sum is σ = 204670631424. Its totient is φ = 75298824720.

The previous prime is 131865819769. The next prime is 131865819779. The reversal of 131865819771 is 177918568131.

It is not a de Polignac number, because 131865819771 - 2¹ = 131865819769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131865819779) 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 in 23 ways as a sum of consecutive naturals, for example, 106015 + ... + 524376.

It is an arithmetic number, because the mean of its divisors is an integer number (8527942976).

Almost surely, 2^131865819771 is an apocalyptic number.

131865819771 is a deficient number, since it is larger than the sum of its proper divisors (72804811653).

131865819771 is a wasteful number, since it uses less digits than its factorization.

131865819771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631831 (or 631824 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 57.

The spelling of 131865819771 in words is "one hundred thirty-one billion, eight hundred sixty-five million, eight hundred nineteen thousand, seven hundred seventy-one".