161129028 has 24 divisors (see below), whose sum is σ = 379846432. Its totient is φ = 53155584.

The previous prime is 161129011. The next prime is 161129029. The reversal of 161129028 is 820921161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 161128986 and 161129004.

It is not an unprimeable number, because it can be changed into a prime (161129029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68050 + ... + 70377.

Almost surely, 2^161129028 is an apocalyptic number.

It is an amenable number.

161129028 is an abundant number, since it is smaller than the sum of its proper divisors (218717404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161129028 is a wasteful number, since it uses less digits than its factorization.

161129028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138531 (or 138529 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 161129028 is about 12693.6609376492. The cubic root of 161129028 is about 544.1574704525.

The spelling of 161129028 in words is "one hundred sixty-one million, one hundred twenty-nine thousand, twenty-eight".