131439785473 has 2 divisors, whose sum is σ = 131439785474. Its totient is φ = 131439785472.

The previous prime is 131439785467. The next prime is 131439785539. The reversal of 131439785473 is 374587934131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126240221809 + 5199563664 = 355303^2 + 72108^2 .

It is a cyclic number.

It is not a de Polignac number, because 131439785473 - 2²¹ = 131437688321 is a prime.

It is not a weakly prime, because it can be changed into another prime (131439780473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65719892736 + 65719892737.

It is an arithmetic number, because the mean of its divisors is an integer number (65719892737).

Almost surely, 2^131439785473 is an apocalyptic number.

It is an amenable number.

131439785473 is a deficient number, since it is larger than the sum of its proper divisors (1).

131439785473 is an equidigital number, since it uses as much as digits as its factorization.

131439785473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 55.

The spelling of 131439785473 in words is "one hundred thirty-one billion, four hundred thirty-nine million, seven hundred eighty-five thousand, four hundred seventy-three".