161215304 has 32 divisors (see below), whose sum is σ = 318816000. Its totient is φ = 76214592.

The previous prime is 161215289. The next prime is 161215309. The reversal of 161215304 is 403512161.

It is a self number, because there is not a number n which added to its sum of digits gives 161215304.

It is not an unprimeable number, because it can be changed into a prime (161215309) 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, 130562 + ... + 131790.

It is an arithmetic number, because the mean of its divisors is an integer number (9963000).

Almost surely, 2^161215304 is an apocalyptic number.

It is an amenable number.

161215304 is a deficient number, since it is larger than the sum of its proper divisors (157600696).

161215304 is a wasteful number, since it uses less digits than its factorization.

161215304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117 (or 2113 counting only the distinct ones).

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

The square root of 161215304 is about 12697.0588720380. The cubic root of 161215304 is about 544.2545755565.

Adding to 161215304 its reverse (403512161), we get a palindrome (564727465).

The spelling of 161215304 in words is "one hundred sixty-one million, two hundred fifteen thousand, three hundred four".