1686168131 has 2 divisors, whose sum is σ = 1686168132. Its totient is φ = 1686168130.

The previous prime is 1686168119. The next prime is 1686168149. The reversal of 1686168131 is 1318616861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1686168131 - 2⁶ = 1686168067 is a prime.

It is a super-2 number, since 2×1686168131² = 5686325932000066322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1686168191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843084065 + 843084066.

It is an arithmetic number, because the mean of its divisors is an integer number (843084066).

Almost surely, 2^1686168131 is an apocalyptic number.

1686168131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686168131 is an equidigital number, since it uses as much as digits as its factorization.

1686168131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 41.

The square root of 1686168131 is about 41062.9776197489. The cubic root of 1686168131 is about 1190.2374902038.

The spelling of 1686168131 in words is "one billion, six hundred eighty-six million, one hundred sixty-eight thousand, one hundred thirty-one".