163649 has 4 divisors (see below), whose sum is σ = 168960. Its totient is φ = 158340.

The previous prime is 163643. The next prime is 163661. The reversal of 163649 is 946361.

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, and also an emirpimes, since its reverse is a distinct semiprime: 946361 = 13 ⋅72797.

It is a cyclic number.

It is not a de Polignac number, because 163649 - 2⁴ = 163633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163643) 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, 2609 + ... + 2670.

It is an arithmetic number, because the mean of its divisors is an integer number (42240).

2¹⁶³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

163649 is a deficient number, since it is larger than the sum of its proper divisors (5311).

163649 is an equidigital number, since it uses as much as digits as its factorization.

163649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5310.

The product of its digits is 3888, while the sum is 29.

The square root of 163649 is about 404.5355361399. The cubic root of 163649 is about 54.6979586528.

The spelling of 163649 in words is "one hundred sixty-three thousand, six hundred forty-nine".