169213729 has 4 divisors (see below), whose sum is σ = 173148976. Its totient is φ = 165278484.

The previous prime is 169213679. The next prime is 169213739. The reversal of 169213729 is 927312961.

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 169213729 - 2¹¹ = 169211681 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 169213691 and 169213700.

It is not an unprimeable number, because it can be changed into a prime (169213739) 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, 1967559 + ... + 1967644.

It is an arithmetic number, because the mean of its divisors is an integer number (43287244).

Almost surely, 2^169213729 is an apocalyptic number.

It is an amenable number.

169213729 is a deficient number, since it is larger than the sum of its proper divisors (3935247).

169213729 is an equidigital number, since it uses as much as digits as its factorization.

169213729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935246.

The product of its digits is 40824, while the sum is 40.

The square root of 169213729 is about 13008.2177487925. The cubic root of 169213729 is about 553.1104521225.

The spelling of 169213729 in words is "one hundred sixty-nine million, two hundred thirteen thousand, seven hundred twenty-nine".