131994886405 has 4 divisors (see below), whose sum is σ = 158393863692. Its totient is φ = 105595909120.

The previous prime is 131994886399. The next prime is 131994886409. The reversal of 131994886405 is 504688499131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96696743521 + 35298142884 = 310961^2 + 187878^2 .

It is a de Polignac number, because none of the positive numbers 2^k-131994886405 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131994886405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131994886409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13199488636 + ... + 13199488645.

It is an arithmetic number, because the mean of its divisors is an integer number (39598465923).

Almost surely, 2^131994886405 is an apocalyptic number.

It is an amenable number.

131994886405 is a deficient number, since it is larger than the sum of its proper divisors (26398977287).

131994886405 is an equidigital number, since it uses as much as digits as its factorization.

131994886405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26398977286.

The product of its (nonzero) digits is 7464960, while the sum is 58.

The spelling of 131994886405 in words is "one hundred thirty-one billion, nine hundred ninety-four million, eight hundred eighty-six thousand, four hundred five".