161115 has 16 divisors (see below), whose sum is σ = 269568.
Its totient is φ = 82016.
The previous prime is 161093. The next prime is 161123. The reversal of 161115 is 511161.
Adding to 161115 its reverse (511161), we get a palindrome (672276).
It can be divided in two parts, 161 and 115, that added together give a triangular number (276 = T23).
It is a cyclic number.
It is not a de Polignac number, because 161115 - 29 = 160603 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (15).
161115 is a lucky number.
It is a junction number, because it is equal to n+sod(n) for n = 161094 and 161103.
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, 112 + ... + 578.
It is an arithmetic number, because the mean of its divisors is an integer number (16848).
161115 is a Friedman number, since it can be written as 11^5+(1+1)^6, using all its digits and the basic arithmetic operations.
2161115 is an apocalyptic number.
161115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
161115 is a deficient number, since it is larger than the sum of its proper divisors (108453).
161115 is a wasteful number, since it uses less digits than its factorization.
161115 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 498.
The product of its digits is 30, while the sum is 15.
The square root of 161115 is about 401.3913302502.
The cubic root of 161115 is about 54.4141678424.
The spelling of 161115 in words is "one hundred sixty-one thousand, one hundred fifteen".