131816797729 has 2 divisors, whose sum is σ = 131816797730. Its totient is φ = 131816797728.

The previous prime is 131816797663. The next prime is 131816797787. The reversal of 131816797729 is 927797618131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102515232400 + 29301565329 = 320180^2 + 171177^2 .

It is a cyclic number.

It is not a de Polignac number, because 131816797729 - 2¹¹ = 131816795681 is a prime.

It is not a weakly prime, because it can be changed into another prime (131816797799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65908398864 + 65908398865.

It is an arithmetic number, because the mean of its divisors is an integer number (65908398865).

Almost surely, 2^131816797729 is an apocalyptic number.

It is an amenable number.

131816797729 is a deficient number, since it is larger than the sum of its proper divisors (1).

131816797729 is an equidigital number, since it uses as much as digits as its factorization.

131816797729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8001504, while the sum is 61.

The spelling of 131816797729 in words is "one hundred thirty-one billion, eight hundred sixteen million, seven hundred ninety-seven thousand, seven hundred twenty-nine".