168971811 has 24 divisors (see below), whose sum is σ = 236026560. Its totient is φ = 107437344.

The previous prime is 168971801. The next prime is 168971819. The reversal of 168971811 is 118179861.

It is not a de Polignac number, because 168971811 - 2⁷ = 168971683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168971819) 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 in 23 ways as a sum of consecutive naturals, for example, 1133965 + ... + 1134113.

It is an arithmetic number, because the mean of its divisors is an integer number (9834440).

Almost surely, 2^168971811 is an apocalyptic number.

168971811 is a deficient number, since it is larger than the sum of its proper divisors (67054749).

168971811 is an equidigital number, since it uses as much as digits as its factorization.

168971811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 254 counting only the distinct ones).

The product of its digits is 24192, while the sum is 42.

The square root of 168971811 is about 12998.9157624780. The cubic root of 168971811 is about 552.8467398887.

The spelling of 168971811 in words is "one hundred sixty-eight million, nine hundred seventy-one thousand, eight hundred eleven".