131432981 has 2 divisors, whose sum is σ = 131432982. Its totient is φ = 131432980.

The previous prime is 131432957. The next prime is 131433007. The reversal of 131432981 is 189234131.

131432981 is nontrivially palindromic in base 15.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108784900 + 22648081 = 10430^2 + 4759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131432981 is a prime.

It is a super-2 number, since 2×131432981² = 34549256989092722, 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 (131432881) 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, 65716490 + 65716491.

It is an arithmetic number, because the mean of its divisors is an integer number (65716491).

Almost surely, 2^131432981 is an apocalyptic number.

It is an amenable number.

131432981 is a deficient number, since it is larger than the sum of its proper divisors (1).

131432981 is an equidigital number, since it uses as much as digits as its factorization.

131432981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 131432981 is about 11464.4224014993. The cubic root of 131432981 is about 508.4342353733.

The spelling of 131432981 in words is "one hundred thirty-one million, four hundred thirty-two thousand, nine hundred eighty-one".