131981867 has 2 divisors, whose sum is σ = 131981868. Its totient is φ = 131981866.

The previous prime is 131981821. The next prime is 131981917. The reversal of 131981867 is 768189131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131981867 - 2¹² = 131977771 is a prime.

It is not a weakly prime, because it can be changed into another prime (131981807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65990933 + 65990934.

It is an arithmetic number, because the mean of its divisors is an integer number (65990934).

Almost surely, 2^131981867 is an apocalyptic number.

131981867 is a deficient number, since it is larger than the sum of its proper divisors (1).

131981867 is an equidigital number, since it uses as much as digits as its factorization.

131981867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 131981867 is about 11488.3361284391. The cubic root of 131981867 is about 509.1410210576.

The spelling of 131981867 in words is "one hundred thirty-one million, nine hundred eighty-one thousand, eight hundred sixty-seven".