131538909699 has 12 divisors (see below), whose sum is σ = 191387515176. Its totient is φ = 87052513632.

The previous prime is 131538909643. The next prime is 131538909707. The reversal of 131538909699 is 996909835131.

It is a happy number.

131538909699 is a `hidden beast` number, since 1 + 3 + 1 + 538 + 9 + 0 + 9 + 6 + 99 = 666.

It is not a de Polignac number, because 131538909699 - 2²⁸ = 131270474243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131538909599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53339769 + ... + 53342234.

It is an arithmetic number, because the mean of its divisors is an integer number (15948959598).

Almost surely, 2^131538909699 is an apocalyptic number.

131538909699 is a deficient number, since it is larger than the sum of its proper divisors (59848605477).

131538909699 is a wasteful number, since it uses less digits than its factorization.

131538909699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106682146 (or 106682143 counting only the distinct ones).

The product of its (nonzero) digits is 14171760, while the sum is 63.

The spelling of 131538909699 in words is "one hundred thirty-one billion, five hundred thirty-eight million, nine hundred nine thousand, six hundred ninety-nine".