169243321 has 4 divisors (see below), whose sum is σ = 182262052. Its totient is φ = 156224592.

The previous prime is 169243303. The next prime is 169243337. The reversal of 169243321 is 123342961.

169243321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123342961 = 7 ⋅17620423.

It can be written as a sum of positive squares in 2 ways, for example, as 41100921 + 128142400 = 6411^2 + 11320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169243321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169243301) 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, 6509346 + ... + 6509371.

It is an arithmetic number, because the mean of its divisors is an integer number (45565513).

Almost surely, 2^169243321 is an apocalyptic number.

It is an amenable number.

169243321 is a deficient number, since it is larger than the sum of its proper divisors (13018731).

169243321 is a wasteful number, since it uses less digits than its factorization.

169243321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13018730.

The product of its digits is 7776, while the sum is 31.

The square root of 169243321 is about 13009.3551339027. The cubic root of 169243321 is about 553.1426927895.

The spelling of 169243321 in words is "one hundred sixty-nine million, two hundred forty-three thousand, three hundred twenty-one".