163809825 has 12 divisors (see below), whose sum is σ = 270832368. Its totient is φ = 87365200.

The previous prime is 163809809. The next prime is 163809847. The reversal of 163809825 is 528908361.

It is not a de Polignac number, because 163809825 - 2⁴ = 163809809 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1091991 + ... + 1092140.

It is an arithmetic number, because the mean of its divisors is an integer number (22569364).

Almost surely, 2^163809825 is an apocalyptic number.

163809825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163809825 is a deficient number, since it is larger than the sum of its proper divisors (107022543).

163809825 is a wasteful number, since it uses less digits than its factorization.

163809825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184144 (or 2184139 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 163809825 is about 12798.8212347856. The cubic root of 163809825 is about 547.1587080848.

The spelling of 163809825 in words is "one hundred sixty-three million, eight hundred nine thousand, eight hundred twenty-five".