163956521 has 8 divisors (see below), whose sum is σ = 166581120. Its totient is φ = 161345808.

The previous prime is 163956511. The next prime is 163956553. The reversal of 163956521 is 125659361.

163956521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 163956521 - 2¹⁴ = 163940137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163956511) 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, 21770 + ... + 28316.

It is an arithmetic number, because the mean of its divisors is an integer number (20822640).

Almost surely, 2^163956521 is an apocalyptic number.

It is an amenable number.

163956521 is a deficient number, since it is larger than the sum of its proper divisors (2624599).

163956521 is an equidigital number, since it uses as much as digits as its factorization.

163956521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6943.

The product of its digits is 48600, while the sum is 38.

The square root of 163956521 is about 12804.5507925893. The cubic root of 163956521 is about 547.3219910171.

The spelling of 163956521 in words is "one hundred sixty-three million, nine hundred fifty-six thousand, five hundred twenty-one".