161204135 has 8 divisors (see below), whose sum is σ = 193517856. Its totient is φ = 128914720.

The previous prime is 161204089. The next prime is 161204137. The reversal of 161204135 is 531402161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161204135 - 2¹⁰ = 161203111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161204135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161204137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15470 + ... + 23700.

It is an arithmetic number, because the mean of its divisors is an integer number (24189732).

Almost surely, 2^161204135 is an apocalyptic number.

161204135 is a deficient number, since it is larger than the sum of its proper divisors (32313721).

161204135 is an equidigital number, since it uses as much as digits as its factorization.

161204135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12153.

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

The square root of 161204135 is about 12696.6190381534. The cubic root of 161204135 is about 544.2420066097.

Adding to 161204135 its reverse (531402161), we get a palindrome (692606296).

The spelling of 161204135 in words is "one hundred sixty-one million, two hundred four thousand, one hundred thirty-five".