161895 has 16 divisors (see below), whose sum is σ = 266112. Its totient is φ = 84000.

The previous prime is 161881. The next prime is 161911. The reversal of 161895 is 598161.

It is a happy number.

It is not a de Polignac number, because 161895 - 2⁴ = 161879 is a prime.

161895 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520 + ... + 770.

It is an arithmetic number, because the mean of its divisors is an integer number (16632).

2¹⁶¹⁸⁹⁵ is an apocalyptic number.

161895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161895 is a deficient number, since it is larger than the sum of its proper divisors (104217).

161895 is a wasteful number, since it uses less digits than its factorization.

161895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302.

The product of its digits is 2160, while the sum is 30.

The square root of 161895 is about 402.3617775087. The cubic root of 161895 is about 54.5018376060.

The spelling of 161895 in words is "one hundred sixty-one thousand, eight hundred ninety-five".