169137128 has 8 divisors (see below), whose sum is σ = 317132130. Its totient is φ = 84568560.

The previous prime is 169137127. The next prime is 169137167. The reversal of 169137128 is 821731961.

It can be written as a sum of positive squares in only one way, i.e., 107702884 + 61434244 = 10378^2 + 7838^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 169137091 and 169137100.

It is not an unprimeable number, because it can be changed into a prime (169137127) 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 as a sum of consecutive naturals, namely, 10571063 + ... + 10571078.

Almost surely, 2^169137128 is an apocalyptic number.

It is an amenable number.

169137128 is a deficient number, since it is larger than the sum of its proper divisors (147995002).

169137128 is a wasteful number, since it uses less digits than its factorization.

169137128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21142147 (or 21142143 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 169137128 is about 13005.2730844070. The cubic root of 169137128 is about 553.0269773972.

The spelling of 169137128 in words is "one hundred sixty-nine million, one hundred thirty-seven thousand, one hundred twenty-eight".