168020861 has 4 divisors (see below), whose sum is σ = 170387424. Its totient is φ = 165654300.

The previous prime is 168020821. The next prime is 168020903.

168020861 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 168020861 - 2¹⁴ = 168004477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168020821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1183175 + ... + 1183316.

It is an arithmetic number, because the mean of its divisors is an integer number (42596856).

Almost surely, 2^168020861 is an apocalyptic number.

It is an amenable number.

168020861 is a deficient number, since it is larger than the sum of its proper divisors (2366563).

168020861 is an equidigital number, since it uses as much as digits as its factorization.

168020861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366562.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 168020861 is about 12962.2861023818. The cubic root of 168020861 is about 551.8076731870.

The spelling of 168020861 in words is "one hundred sixty-eight million, twenty thousand, eight hundred sixty-one".