168871861 has 2 divisors, whose sum is σ = 168871862. Its totient is φ = 168871860.

The previous prime is 168871853. The next prime is 168871909. The reversal of 168871861 is 168178861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97891236 + 70980625 = 9894^2 + 8425^2 .

It is a cyclic number.

It is not a de Polignac number, because 168871861 - 2³ = 168871853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168871831) 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, 84435930 + 84435931.

It is an arithmetic number, because the mean of its divisors is an integer number (84435931).

Almost surely, 2^168871861 is an apocalyptic number.

It is an amenable number.

168871861 is a deficient number, since it is larger than the sum of its proper divisors (1).

168871861 is an equidigital number, since it uses as much as digits as its factorization.

168871861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 46.

The square root of 168871861 is about 12995.0706423628. The cubic root of 168871861 is about 552.7377119783.

The spelling of 168871861 in words is "one hundred sixty-eight million, eight hundred seventy-one thousand, eight hundred sixty-one".