161203823 has 12 divisors (see below), whose sum is σ = 178001880. Its totient is φ = 145878480.

The previous prime is 161203817. The next prime is 161203853. The reversal of 161203823 is 328302161.

It is not a de Polignac number, because 161203823 - 2⁴ = 161203807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161203792 and 161203801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161203853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24533 + ... + 30401.

It is an arithmetic number, because the mean of its divisors is an integer number (14833490).

Almost surely, 2^161203823 is an apocalyptic number.

161203823 is a deficient number, since it is larger than the sum of its proper divisors (16798057).

161203823 is a wasteful number, since it uses less digits than its factorization.

161203823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6118 (or 6107 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 161203823 is about 12696.6067514120. The cubic root of 161203823 is about 544.2416554946.

Adding to 161203823 its reverse (328302161), we get a palindrome (489505984).

The spelling of 161203823 in words is "one hundred sixty-one million, two hundred three thousand, eight hundred twenty-three".