823571423 has 4 divisors (see below), whose sum is σ = 823670520. Its totient is φ = 823472328.

The previous prime is 823571381. The next prime is 823571447. The reversal of 823571423 is 324175328.

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

It is a cyclic number.

It is not a de Polignac number, because 823571423 - 2¹⁰ = 823570399 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 (823571923) 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, 35813 + ... + 54126.

It is an arithmetic number, because the mean of its divisors is an integer number (205917630).

Almost surely, 2^823571423 is an apocalyptic number.

823571423 is a deficient number, since it is larger than the sum of its proper divisors (99097).

823571423 is an equidigital number, since it uses as much as digits as its factorization.

823571423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99096.

The product of its digits is 40320, while the sum is 35.

The square root of 823571423 is about 28697.9341242536. The cubic root of 823571423 is about 937.3470628864.

The spelling of 823571423 in words is "eight hundred twenty-three million, five hundred seventy-one thousand, four hundred twenty-three".