168989861 has 4 divisors (see below), whose sum is σ = 169632672. Its totient is φ = 168347052.

The previous prime is 168989839. The next prime is 168989893.

168989861 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 168989861 - 2⁶ = 168989797 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168989797 and 168989806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168983861) 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 3 ways as a sum of consecutive naturals, for example, 321011 + ... + 321536.

It is an arithmetic number, because the mean of its divisors is an integer number (42408168).

Almost surely, 2^168989861 is an apocalyptic number.

It is an amenable number.

168989861 is a deficient number, since it is larger than the sum of its proper divisors (642811).

168989861 is an equidigital number, since it uses as much as digits as its factorization.

168989861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642810.

The product of its digits is 1492992, while the sum is 56.

The square root of 168989861 is about 12999.6100326125. The cubic root of 168989861 is about 552.8664246876.

The spelling of 168989861 in words is "one hundred sixty-eight million, nine hundred eighty-nine thousand, eight hundred sixty-one".