131132187678781 has 2 divisors, whose sum is σ = 131132187678782. Its totient is φ = 131132187678780.

The previous prime is 131132187678763. The next prime is 131132187678871. The reversal of 131132187678781 is 187876781231131.

Together with next prime (131132187678871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68543662392100 + 62588525286681 = 8279110^2 + 7911291^2 .

It is a cyclic number.

It is not a de Polignac number, because 131132187678781 - 2⁵ = 131132187678749 is a prime.

It is a super-2 number, since 2×131132187678781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131132187628781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65566093839390 + 65566093839391.

It is an arithmetic number, because the mean of its divisors is an integer number (65566093839391).

Almost surely, 2^{131132187678781} is an apocalyptic number.

It is an amenable number.

131132187678781 is a deficient number, since it is larger than the sum of its proper divisors (1).

131132187678781 is an equidigital number, since it uses as much as digits as its factorization.

131132187678781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18966528, while the sum is 64.

The spelling of 131132187678781 in words is "one hundred thirty-one trillion, one hundred thirty-two billion, one hundred eighty-seven million, six hundred seventy-eight thousand, seven hundred eighty-one".