163857797 has 4 divisors (see below), whose sum is σ = 165307980. Its totient is φ = 162407616.

The previous prime is 163857791. The next prime is 163857851. The reversal of 163857797 is 797758361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21031396 + 142826401 = 4586^2 + 11951^2 .

It is a cyclic number.

It is not a de Polignac number, because 163857797 - 2¹⁰ = 163856773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163857791) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 724922 + ... + 725147.

It is an arithmetic number, because the mean of its divisors is an integer number (41326995).

Almost surely, 2^163857797 is an apocalyptic number.

It is an amenable number.

163857797 is a deficient number, since it is larger than the sum of its proper divisors (1450183).

163857797 is a wasteful number, since it uses less digits than its factorization.

163857797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450182.

The product of its digits is 2222640, while the sum is 53.

The square root of 163857797 is about 12800.6951764348. The cubic root of 163857797 is about 547.2121150069.

The spelling of 163857797 in words is "one hundred sixty-three million, eight hundred fifty-seven thousand, seven hundred ninety-seven".