169808121 has 24 divisors (see below), whose sum is σ = 296809344. Its totient is φ = 91324800.

The previous prime is 169808117. The next prime is 169808129. The reversal of 169808121 is 121808961.

169808121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 169808121 - 2² = 169808117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (169808129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78205 + ... + 80346.

It is an arithmetic number, because the mean of its divisors is an integer number (12367056).

Almost surely, 2^169808121 is an apocalyptic number.

It is an amenable number.

169808121 is a deficient number, since it is larger than the sum of its proper divisors (127001223).

169808121 is a wasteful number, since it uses less digits than its factorization.

169808121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158581 (or 158578 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 169808121 is about 13031.0445091712. The cubic root of 169808121 is about 553.7573268024.

The spelling of 169808121 in words is "one hundred sixty-nine million, eight hundred eight thousand, one hundred twenty-one".