159969 has 4 divisors (see below), whose sum is σ = 213296. Its totient is φ = 106644.

The previous prime is 159937. The next prime is 159977. The reversal of 159969 is 969951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 159969 - 2⁵ = 159937 is a prime.

It is a super-2 number, since 2×159969² = 51180161922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26659 + ... + 26664.

It is an arithmetic number, because the mean of its divisors is an integer number (53324).

2¹⁵⁹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

159969 is a deficient number, since it is larger than the sum of its proper divisors (53327).

159969 is an equidigital number, since it uses as much as digits as its factorization.

159969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53326.

The product of its digits is 21870, while the sum is 39.

The square root of 159969 is about 399.9612481229. The cubic root of 159969 is about 54.2848459827.

It can be divided in two parts, 159 and 969, that added together give a triangular number (1128 = T₄₇).

The spelling of 159969 in words is "one hundred fifty-nine thousand, nine hundred sixty-nine".