168649 has 4 divisors (see below), whose sum is σ = 181636. Its totient is φ = 155664.

The previous prime is 168643. The next prime is 168673. The reversal of 168649 is 946861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8649 + 160000 = 93^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 168649 - 2⁵ = 168617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168643) 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, 6474 + ... + 6499.

It is an arithmetic number, because the mean of its divisors is an integer number (45409).

2¹⁶⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

168649 is a deficient number, since it is larger than the sum of its proper divisors (12987).

168649 is a wasteful number, since it uses less digits than its factorization.

168649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12986.

The product of its digits is 10368, while the sum is 34.

The square root of 168649 is about 410.6689664438. The cubic root of 168649 is about 55.2494454740.

It can be divided in two parts, 16 and 8649, that multiplied together give a square (138384 = 372²).

The spelling of 168649 in words is "one hundred sixty-eight thousand, six hundred forty-nine".