163830181 has 4 divisors (see below), whose sum is σ = 165452364. Its totient is φ = 162208000.

The previous prime is 163830169. The next prime is 163830211. The reversal of 163830181 is 181038361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181038361 = 7 ⋅25862623.

It can be written as a sum of positive squares in 2 ways, for example, as 82992100 + 80838081 = 9110^2 + 8991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163830181 is a prime.

It is a super-2 number, since 2×163830181² = 53680656412985522, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163830101) 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, 810940 + ... + 811141.

It is an arithmetic number, because the mean of its divisors is an integer number (41363091).

Almost surely, 2^163830181 is an apocalyptic number.

It is an amenable number.

163830181 is a deficient number, since it is larger than the sum of its proper divisors (1622183).

163830181 is a wasteful number, since it uses less digits than its factorization.

163830181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622182.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 163830181 is about 12799.6164395657. The cubic root of 163830181 is about 547.1813715633.

The spelling of 163830181 in words is "one hundred sixty-three million, eight hundred thirty thousand, one hundred eighty-one".