163121636 has 12 divisors (see below), whose sum is σ = 295306620. Its totient is φ = 78748320.

The previous prime is 163121633. The next prime is 163121663. The reversal of 163121636 is 636121361.

It is a happy number.

163121636 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 101404900 + 61716736 = 10070^2 + 7856^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 163121599 and 163121608.

It is not an unprimeable number, because it can be changed into a prime (163121633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 702995 + ... + 703226.

It is an arithmetic number, because the mean of its divisors is an integer number (24608885).

Almost surely, 2^163121636 is an apocalyptic number.

It is an amenable number.

163121636 is a deficient number, since it is larger than the sum of its proper divisors (132184984).

163121636 is a wasteful number, since it uses less digits than its factorization.

163121636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406254 (or 1406252 counting only the distinct ones).

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

The square root of 163121636 is about 12771.9080798446. The cubic root of 163121636 is about 546.3914013411.

Adding to 163121636 its reverse (636121361), we get a palindrome (799242997).

The spelling of 163121636 in words is "one hundred sixty-three million, one hundred twenty-one thousand, six hundred thirty-six".