161004506 has 16 divisors (see below), whose sum is σ = 260786400. Its totient is φ = 74109168.

The previous prime is 161004497. The next prime is 161004509. The reversal of 161004506 is 605400161.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161004509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1685 + ... + 18023.

It is an arithmetic number, because the mean of its divisors is an integer number (16299150).

Almost surely, 2^161004506 is an apocalyptic number.

161004506 is a deficient number, since it is larger than the sum of its proper divisors (99781894).

161004506 is a wasteful number, since it uses less digits than its factorization.

161004506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16733.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 161004506 is about 12688.7551004817. The cubic root of 161004506 is about 544.0172576885.

Adding to 161004506 its reverse (605400161), we get a palindrome (766404667).

The spelling of 161004506 in words is "one hundred sixty-one million, four thousand, five hundred six".