131404478636 has 24 divisors (see below), whose sum is σ = 231157540320. Its totient is φ = 65359953792.

The previous prime is 131404478617. The next prime is 131404478657. The reversal of 131404478636 is 636874404131.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1032665 + ... + 1152911.

It is an arithmetic number, because the mean of its divisors is an integer number (9631564180).

Almost surely, 2^131404478636 is an apocalyptic number.

It is an amenable number.

131404478636 is a deficient number, since it is larger than the sum of its proper divisors (99753061684).

131404478636 is a wasteful number, since it uses less digits than its factorization.

131404478636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121673 (or 121671 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 131404478636 in words is "one hundred thirty-one billion, four hundred four million, four hundred seventy-eight thousand, six hundred thirty-six".