161915 has 16 divisors (see below), whose sum is σ = 217728. Its totient is φ = 114816.

The previous prime is 161911. The next prime is 161921. The reversal of 161915 is 519161.

It is not a de Polignac number, because 161915 - 2² = 161911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161911) 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, 3029 + ... + 3081.

It is an arithmetic number, because the mean of its divisors is an integer number (13608).

2¹⁶¹⁹¹⁵ is an apocalyptic number.

161915 is a deficient number, since it is larger than the sum of its proper divisors (55813).

161915 is a wasteful number, since it uses less digits than its factorization.

161915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118.

The product of its digits is 270, while the sum is 23.

The square root of 161915 is about 402.3866299966. The cubic root of 161915 is about 54.5040818422.

It can be divided in two parts, 1 and 61915, that added together give a palindrome (61916).

The spelling of 161915 in words is "one hundred sixty-one thousand, nine hundred fifteen".