168121861 has 8 divisors (see below), whose sum is σ = 177292800. Its totient is φ = 158983200.

The previous prime is 168121859. The next prime is 168121871.

It is a happy number.

168121861 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168121861 - 2¹ = 168121859 is a prime.

It is a super-2 number, since 2×168121861² = 56529920292206642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168121831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3036 + ... + 18586.

It is an arithmetic number, because the mean of its divisors is an integer number (22161600).

Almost surely, 2^168121861 is an apocalyptic number.

It is an amenable number.

168121861 is a deficient number, since it is larger than the sum of its proper divisors (9170939).

168121861 is a wasteful number, since it uses less digits than its factorization.

168121861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16139.

The product of its digits is 4608, while the sum is 34.

The square root of 168121861 is about 12966.1814347941. The cubic root of 168121861 is about 551.9182178165.

The spelling of 168121861 in words is "one hundred sixty-eight million, one hundred twenty-one thousand, eight hundred sixty-one".