131411981 has 2 divisors, whose sum is σ = 131411982. Its totient is φ = 131411980.

The previous prime is 131411977. The next prime is 131412019. The reversal of 131411981 is 189114131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104734756 + 26677225 = 10234^2 + 5165^2 .

It is an emirp because it is prime and its reverse (189114131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131411981 - 2² = 131411977 is a prime.

It is a super-2 number, since 2×131411981² = 34538217500688722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131411911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65705990 + 65705991.

It is an arithmetic number, because the mean of its divisors is an integer number (65705991).

Almost surely, 2^131411981 is an apocalyptic number.

It is an amenable number.

131411981 is a deficient number, since it is larger than the sum of its proper divisors (1).

131411981 is an equidigital number, since it uses as much as digits as its factorization.

131411981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 29.

The square root of 131411981 is about 11463.5064879818. The cubic root of 131411981 is about 508.4071551900.

The spelling of 131411981 in words is "one hundred thirty-one million, four hundred eleven thousand, nine hundred eighty-one".