131020202009989 has 2 divisors, whose sum is σ = 131020202009990. Its totient is φ = 131020202009988.

The previous prime is 131020202009987. The next prime is 131020202010037. The reversal of 131020202009989 is 989900202020131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119188356344964 + 11831845665025 = 10917342^2 + 3439745^2 .

It is a cyclic number.

It is not a de Polignac number, because 131020202009989 - 2¹ = 131020202009987 is a prime.

Together with 131020202009987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131020202009987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65510101004994 + 65510101004995.

It is an arithmetic number, because the mean of its divisors is an integer number (65510101004995).

Almost surely, 2^{131020202009989} is an apocalyptic number.

It is an amenable number.

131020202009989 is a deficient number, since it is larger than the sum of its proper divisors (1).

131020202009989 is an equidigital number, since it uses as much as digits as its factorization.

131020202009989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 131020202009989 in words is "one hundred thirty-one trillion, twenty billion, two hundred two million, nine thousand, nine hundred eighty-nine".