163209823 has 16 divisors (see below), whose sum is σ = 195198976. Its totient is φ = 133513920.

The previous prime is 163209799. The next prime is 163209833. The reversal of 163209823 is 328902361.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163209823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163209833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10690 + ... + 20992.

It is an arithmetic number, because the mean of its divisors is an integer number (12199936).

Almost surely, 2^163209823 is an apocalyptic number.

163209823 is a deficient number, since it is larger than the sum of its proper divisors (31989153).

163209823 is a wasteful number, since it uses less digits than its factorization.

163209823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10414.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 163209823 is about 12775.3599949277. The cubic root of 163209823 is about 546.4898471780.

The spelling of 163209823 in words is "one hundred sixty-three million, two hundred nine thousand, eight hundred twenty-three".