169129421 has 4 divisors (see below), whose sum is σ = 174961500. Its totient is φ = 163297344.

The previous prime is 169129391. The next prime is 169129423. The reversal of 169129421 is 124921961.

169129421 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.

It can be written as a sum of positive squares in 2 ways, for example, as 57002500 + 112126921 = 7550^2 + 10589^2 .

It is a cyclic number.

It is not a de Polignac number, because 169129421 - 2⁶ = 169129357 is a prime.

It is a super-2 number, since 2×169129421² = 57209522095590482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169129423) 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, 2915996 + ... + 2916053.

It is an arithmetic number, because the mean of its divisors is an integer number (43740375).

Almost surely, 2^169129421 is an apocalyptic number.

It is an amenable number.

169129421 is a deficient number, since it is larger than the sum of its proper divisors (5832079).

169129421 is an equidigital number, since it uses as much as digits as its factorization.

169129421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5832078.

The product of its digits is 7776, while the sum is 35.

The square root of 169129421 is about 13004.9767781415. The cubic root of 169129421 is about 553.0185774208.

The spelling of 169129421 in words is "one hundred sixty-nine million, one hundred twenty-nine thousand, four hundred twenty-one".