131020320989 has 2 divisors, whose sum is σ = 131020320990. Its totient is φ = 131020320988.

The previous prime is 131020320979. The next prime is 131020321043. The reversal of 131020320989 is 989023020131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110328936964 + 20691384025 = 332158^2 + 143845^2 .

It is a cyclic number.

It is not a de Polignac number, because 131020320989 - 2¹² = 131020316893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131020320919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65510160494 + 65510160495.

It is an arithmetic number, because the mean of its divisors is an integer number (65510160495).

Almost surely, 2^131020320989 is an apocalyptic number.

It is an amenable number.

131020320989 is a deficient number, since it is larger than the sum of its proper divisors (1).

131020320989 is an equidigital number, since it uses as much as digits as its factorization.

131020320989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 131020320989 in words is "one hundred thirty-one billion, twenty million, three hundred twenty thousand, nine hundred eighty-nine".