161504504 has 32 divisors (see below), whose sum is σ = 346644480. Its totient is φ = 69103584.

The previous prime is 161504491. The next prime is 161504507. The reversal of 161504504 is 405405161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161504507) 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 in 7 ways as a sum of consecutive naturals, for example, 38729 + ... + 42695.

It is an arithmetic number, because the mean of its divisors is an integer number (10832640).

Almost surely, 2^161504504 is an apocalyptic number.

161504504 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161504504 is an abundant number, since it is smaller than the sum of its proper divisors (185139976).

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

161504504 is a wasteful number, since it uses less digits than its factorization.

161504504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4707 (or 4703 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 161504504 is about 12708.4422334132. The cubic root of 161504504 is about 544.5798225924.

Adding to 161504504 its reverse (405405161), we get a palindrome (566909665).

The spelling of 161504504 in words is "one hundred sixty-one million, five hundred four thousand, five hundred four".