163900181 has 4 divisors (see below), whose sum is σ = 164724000. Its totient is φ = 163076364.

The previous prime is 163900169. The next prime is 163900189. The reversal of 163900181 is 181009361.

It is a happy number.

163900181 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 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 163900181 - 2¹⁰ = 163899157 is a prime.

It is a super-2 number, since 2×163900181² = 53726538663665522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163900189) 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, 411611 + ... + 412008.

It is an arithmetic number, because the mean of its divisors is an integer number (41181000).

Almost surely, 2^163900181 is an apocalyptic number.

It is an amenable number.

163900181 is a deficient number, since it is larger than the sum of its proper divisors (823819).

163900181 is an equidigital number, since it uses as much as digits as its factorization.

163900181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823818.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 163900181 is about 12802.3506044789. The cubic root of 163900181 is about 547.2592921716.

The spelling of 163900181 in words is "one hundred sixty-three million, nine hundred thousand, one hundred eighty-one".