161995 has 8 divisors (see below), whose sum is σ = 196560. Its totient is φ = 128160.

The previous prime is 161983. The next prime is 161999. The reversal of 161995 is 599161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-161995 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 805 + ... + 985.

It is an arithmetic number, because the mean of its divisors is an integer number (24570).

2¹⁶¹⁹⁹⁵ is an apocalyptic number.

161995 is a deficient number, since it is larger than the sum of its proper divisors (34565).

161995 is a wasteful number, since it uses less digits than its factorization.

161995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365.

The product of its digits is 2430, while the sum is 31.

The square root of 161995 is about 402.4860246021. The cubic root of 161995 is about 54.5130569395.

It can be divided in two parts, 161 and 995, that added together give a square (1156 = 34²).

The spelling of 161995 in words is "one hundred sixty-one thousand, nine hundred ninety-five".