161500115 has 16 divisors (see below), whose sum is σ = 221745600. Its totient is φ = 110613120.

The previous prime is 161500081. The next prime is 161500117. The reversal of 161500115 is 511005161.

It is not a de Polignac number, because 161500115 - 2²⁰ = 160451539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161500117) 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 15 ways as a sum of consecutive naturals, for example, 34961 + ... + 39309.

It is an arithmetic number, because the mean of its divisors is an integer number (13859100).

Almost surely, 2^161500115 is an apocalyptic number.

161500115 is a deficient number, since it is larger than the sum of its proper divisors (60245485).

161500115 is a wasteful number, since it uses less digits than its factorization.

161500115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5422.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 161500115 is about 12708.2695517525. The cubic root of 161500115 is about 544.5748894327.

Adding to 161500115 its reverse (511005161), we get a palindrome (672505276).

The spelling of 161500115 in words is "one hundred sixty-one million, five hundred thousand, one hundred fifteen".