161500323 has 16 divisors (see below), whose sum is σ = 240001920. Its totient is φ = 95999616.

The previous prime is 161500307. The next prime is 161500331. The reversal of 161500323 is 323005161.

It is not a de Polignac number, because 161500323 - 2⁴ = 161500307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161500323.

It is not an unprimeable number, because it can be changed into a prime (161500373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82365 + ... + 84302.

It is an arithmetic number, because the mean of its divisors is an integer number (15000120).

Almost surely, 2^161500323 is an apocalyptic number.

161500323 is a deficient number, since it is larger than the sum of its proper divisors (78501597).

161500323 is a wasteful number, since it uses less digits than its factorization.

161500323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166706.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 161500323 is about 12708.2777353975. The cubic root of 161500323 is about 544.5751232231.

Adding to 161500323 its reverse (323005161), we get a palindrome (484505484).

The spelling of 161500323 in words is "one hundred sixty-one million, five hundred thousand, three hundred twenty-three".