131787144821 has 4 divisors (see below), whose sum is σ = 131787885132. Its totient is φ = 131786404512.

The previous prime is 131787144791. The next prime is 131787144869. The reversal of 131787144821 is 128441787131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 68439792100 + 63347352721 = 261610^2 + 251689^2 .

It is a cyclic number.

It is not a de Polignac number, because 131787144821 - 2²⁶ = 131720035957 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 (131787144871) 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, 76625 + ... + 519081.

It is an arithmetic number, because the mean of its divisors is an integer number (32946971283).

Almost surely, 2^131787144821 is an apocalyptic number.

It is an amenable number.

131787144821 is a deficient number, since it is larger than the sum of its proper divisors (740311).

131787144821 is an equidigital number, since it uses as much as digits as its factorization.

131787144821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740310.

The product of its digits is 301056, while the sum is 47.

The spelling of 131787144821 in words is "one hundred thirty-one billion, seven hundred eighty-seven million, one hundred forty-four thousand, eight hundred twenty-one".