161500235 has 16 divisors (see below), whose sum is σ = 215443200. Its totient is φ = 115413120.

The previous prime is 161500223. The next prime is 161500243. The reversal of 161500235 is 532005161.

It is not a de Polignac number, because 161500235 - 2⁸ = 161499979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161500235.

It is an unprimeable number.

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, 38060 + ... + 42089.

It is an arithmetic number, because the mean of its divisors is an integer number (13465200).

Almost surely, 2^161500235 is an apocalyptic number.

161500235 is a deficient number, since it is larger than the sum of its proper divisors (53942965).

161500235 is a wasteful number, since it uses less digits than its factorization.

161500235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80198.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 161500235 is about 12708.2742730868. The cubic root of 161500235 is about 544.5750243118.

Adding to 161500235 its reverse (532005161), we get a palindrome (693505396).

The spelling of 161500235 in words is "one hundred sixty-one million, five hundred thousand, two hundred thirty-five".