131000029999981 has 2 divisors, whose sum is σ = 131000029999982. Its totient is φ = 131000029999980.

The previous prime is 131000029999967. The next prime is 131000030000011. The reversal of 131000029999981 is 189999920000131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126442940749225 + 4557089250756 = 11244685^2 + 2134734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131000029999981 is a prime.

It is a super-2 number, since 2×131000029999981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131000029997981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65500014999990 + 65500014999991.

It is an arithmetic number, because the mean of its divisors is an integer number (65500014999991).

Almost surely, 2^{131000029999981} is an apocalyptic number.

It is an amenable number.

131000029999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

131000029999981 is an equidigital number, since it uses as much as digits as its factorization.

131000029999981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2834352, while the sum is 61.

The spelling of 131000029999981 in words is "one hundred thirty-one trillion, twenty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".