161004 has 12 divisors (see below), whose sum is σ = 375704. Its totient is φ = 53664.

The previous prime is 160997. The next prime is 161009. The reversal of 161004 is 400161.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 13417 = 161004 / (1 + 6 + 1 + 0 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (161009) 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, 6697 + ... + 6720.

2¹⁶¹⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

161004 is an abundant number, since it is smaller than the sum of its proper divisors (214700).

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

161004 is a wasteful number, since it uses less digits than its factorization.

161004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13424 (or 13422 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 161004 is about 401.2530373717. The cubic root of 161004 is about 54.4016687781.

Adding to 161004 its product of nonzero digits (24), we get a triangular number (161028 = T₅₆₇).

Adding to 161004 its reverse (400161), we get a palindrome (561165).

The spelling of 161004 in words is "one hundred sixty-one thousand, four".