169107221 has 4 divisors (see below), whose sum is σ = 169188492. Its totient is φ = 169025952.

The previous prime is 169107217. The next prime is 169107223. The reversal of 169107221 is 122701961.

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 76755121 + 92352100 = 8761^2 + 9610^2 .

It is a cyclic number.

It is not a de Polignac number, because 169107221 - 2² = 169107217 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 (169107223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37430 + ... + 41703.

It is an arithmetic number, because the mean of its divisors is an integer number (42297123).

Almost surely, 2^169107221 is an apocalyptic number.

It is an amenable number.

169107221 is a deficient number, since it is larger than the sum of its proper divisors (81271).

169107221 is an equidigital number, since it uses as much as digits as its factorization.

169107221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81270.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 169107221 is about 13004.1232307296. The cubic root of 169107221 is about 552.9943798772.

The spelling of 169107221 in words is "one hundred sixty-nine million, one hundred seven thousand, two hundred twenty-one".