163969 has 4 divisors (see below), whose sum is σ = 176596. Its totient is φ = 151344.

The previous prime is 163927. The next prime is 163973. The reversal of 163969 is 969361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44944 + 119025 = 212^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 163969 - 2⁷ = 163841 is a prime.

It is a super-2 number, since 2×163969² = 53771665922, which contains 22 as substring.

It is a Duffinian number.

163969 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (163909) 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, 6294 + ... + 6319.

It is an arithmetic number, because the mean of its divisors is an integer number (44149).

2¹⁶³⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

163969 is a deficient number, since it is larger than the sum of its proper divisors (12627).

163969 is a wasteful number, since it uses less digits than its factorization.

163969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12626.

The product of its digits is 8748, while the sum is 34.

The square root of 163969 is about 404.9308582956. The cubic root of 163969 is about 54.7335876523.

It can be divided in two parts, 16 and 3969, that multiplied together give a square (63504 = 252²).

The spelling of 163969 in words is "one hundred sixty-three thousand, nine hundred sixty-nine".