161530004 has 12 divisors (see below), whose sum is σ = 282781044. Its totient is φ = 80735424.

The previous prime is 161530003. The next prime is 161530063. The reversal of 161530004 is 400035161.

It can be written as a sum of positive squares in 2 ways, for example, as 53993104 + 107536900 = 7348^2 + 10370^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161530003) 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, 8864 + ... + 20040.

It is an arithmetic number, because the mean of its divisors is an integer number (23565087).

Almost surely, 2^161530004 is an apocalyptic number.

It is an amenable number.

161530004 is a deficient number, since it is larger than the sum of its proper divisors (121251040).

161530004 is a wasteful number, since it uses less digits than its factorization.

161530004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14794 (or 14792 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 161530004 is about 12709.4454639060. The cubic root of 161530004 is about 544.6084823806.

Adding to 161530004 its reverse (400035161), we get a palindrome (561565165).

The spelling of 161530004 in words is "one hundred sixty-one million, five hundred thirty thousand, four".