163813893 has 4 divisors (see below), whose sum is σ = 218418528. Its totient is φ = 109209260.

The previous prime is 163813883. The next prime is 163813927. The reversal of 163813893 is 398318361.

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.

It is a cyclic number.

It is not a de Polignac number, because 163813893 - 2⁹ = 163813381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163813813) 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, 27302313 + ... + 27302318.

It is an arithmetic number, because the mean of its divisors is an integer number (54604632).

Almost surely, 2^163813893 is an apocalyptic number.

It is an amenable number.

163813893 is a deficient number, since it is larger than the sum of its proper divisors (54604635).

163813893 is an equidigital number, since it uses as much as digits as its factorization.

163813893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54604634.

The product of its digits is 93312, while the sum is 42.

The square root of 163813893 is about 12798.9801546842. The cubic root of 163813893 is about 547.1632373679.

The spelling of 163813893 in words is "one hundred sixty-three million, eight hundred thirteen thousand, eight hundred ninety-three".