131778321224287 has 4 divisors (see below), whose sum is σ = 131778418637520. Its totient is φ = 131778223811056.

The previous prime is 131778321224267. The next prime is 131778321224299. The reversal of 131778321224287 is 782422123877131.

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

It is a cyclic number.

It is not a de Polignac number, because 131778321224287 - 2¹⁹ = 131778320699999 is a prime.

It is a super-2 number, since 2×131778321224287² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131778321224227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46648462 + ... + 49392667.

It is an arithmetic number, because the mean of its divisors is an integer number (32944604659380).

Almost surely, 2^{131778321224287} is an apocalyptic number.

131778321224287 is a deficient number, since it is larger than the sum of its proper divisors (97413233).

131778321224287 is an equidigital number, since it uses as much as digits as its factorization.

131778321224287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97413232.

The product of its digits is 12644352, while the sum is 58.

The spelling of 131778321224287 in words is "one hundred thirty-one trillion, seven hundred seventy-eight billion, three hundred twenty-one million, two hundred twenty-four thousand, two hundred eighty-seven".