2181686867 has 2 divisors, whose sum is σ = 2181686868. Its totient is φ = 2181686866.

The previous prime is 2181686863. The next prime is 2181686887. The reversal of 2181686867 is 7686861812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2181686867 - 2² = 2181686863 is a prime.

It is not a weakly prime, because it can be changed into another prime (2181686863) 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, 1090843433 + 1090843434.

It is an arithmetic number, because the mean of its divisors is an integer number (1090843434).

Almost surely, 2^2181686867 is an apocalyptic number.

2181686867 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181686867 is an equidigital number, since it uses as much as digits as its factorization.

2181686867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 53.

The square root of 2181686867 is about 46708.5309873903. The cubic root of 2181686867 is about 1296.9726136054.

The spelling of 2181686867 in words is "two billion, one hundred eighty-one million, six hundred eighty-six thousand, eight hundred sixty-seven".