168689449 has 4 divisors (see below), whose sum is σ = 170721936. Its totient is φ = 166656964.

The previous prime is 168689441. The next prime is 168689483. The reversal of 168689449 is 944986861.

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 168689449 - 2³ = 168689441 is a prime.

It is a super-2 number, since 2×168689449² = 56912260407847202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168689449.

It is not an unprimeable number, because it can be changed into a prime (168689441) 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, 1016119 + ... + 1016284.

It is an arithmetic number, because the mean of its divisors is an integer number (42680484).

Almost surely, 2^168689449 is an apocalyptic number.

It is an amenable number.

168689449 is a deficient number, since it is larger than the sum of its proper divisors (2032487).

168689449 is an equidigital number, since it uses as much as digits as its factorization.

168689449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032486.

The product of its digits is 2985984, while the sum is 55.

The square root of 168689449 is about 12988.0502385847. The cubic root of 168689449 is about 552.5386215435.

The spelling of 168689449 in words is "one hundred sixty-eight million, six hundred eighty-nine thousand, four hundred forty-nine".