163621243 has 4 divisors (see below), whose sum is σ = 173246040. Its totient is φ = 153996448.

The previous prime is 163621189. The next prime is 163621259. The reversal of 163621243 is 342126361.

163621243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342126361 = 43 ⋅7956427.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163621243 is a prime.

It is a super-2 number, since 2×163621243² = 53543822321730098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163621273) 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, 4812373 + ... + 4812406.

It is an arithmetic number, because the mean of its divisors is an integer number (43311510).

Almost surely, 2^163621243 is an apocalyptic number.

163621243 is a deficient number, since it is larger than the sum of its proper divisors (9624797).

163621243 is an equidigital number, since it uses as much as digits as its factorization.

163621243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9624796.

The product of its digits is 5184, while the sum is 28.

The square root of 163621243 is about 12791.4519504238. The cubic root of 163621243 is about 546.9486598273.

The spelling of 163621243 in words is "one hundred sixty-three million, six hundred twenty-one thousand, two hundred forty-three".