131201139116261 has 2 divisors, whose sum is σ = 131201139116262. Its totient is φ = 131201139116260.

The previous prime is 131201139116233. The next prime is 131201139116323. The reversal of 131201139116261 is 162611931102131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107194755180100 + 24006383936161 = 10353490^2 + 4899631^2 .

It is a cyclic number.

It is not a de Polignac number, because 131201139116261 - 2⁶ = 131201139116197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131201139116561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65600569558130 + 65600569558131.

It is an arithmetic number, because the mean of its divisors is an integer number (65600569558131).

Almost surely, 2^{131201139116261} is an apocalyptic number.

It is an amenable number.

131201139116261 is a deficient number, since it is larger than the sum of its proper divisors (1).

131201139116261 is an equidigital number, since it uses as much as digits as its factorization.

131201139116261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 131201139116261 in words is "one hundred thirty-one trillion, two hundred one billion, one hundred thirty-nine million, one hundred sixteen thousand, two hundred sixty-one".