161695 has 8 divisors (see below), whose sum is σ = 197136. Its totient is φ = 127296.

The previous prime is 161683. The next prime is 161717. The reversal of 161695 is 596161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161695 is a prime.

It is a super-2 number, since 2×161695² = 52290546050, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 144 + ... + 586.

It is an arithmetic number, because the mean of its divisors is an integer number (24642).

2¹⁶¹⁶⁹⁵ is an apocalyptic number.

161695 is a deficient number, since it is larger than the sum of its proper divisors (35441).

161695 is an equidigital number, since it uses as much as digits as its factorization.

161695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521.

The product of its digits is 1620, while the sum is 28.

The square root of 161695 is about 402.1131681505. The cubic root of 161695 is about 54.4793850714.

It can be divided in two parts, 1616 and 95, that added together give a triangular number (1711 = T₅₈).

The spelling of 161695 in words is "one hundred sixty-one thousand, six hundred ninety-five".