823145005 has 4 divisors (see below), whose sum is σ = 987774012. Its totient is φ = 658516000.

The previous prime is 823144991. The next prime is 823145009. The reversal of 823145005 is 500541328.

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 269813476 + 553331529 = 16426^2 + 23523^2 .

It is not a de Polignac number, because 823145005 - 2¹⁵ = 823112237 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 (823145009) 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, 82314496 + ... + 82314505.

It is an arithmetic number, because the mean of its divisors is an integer number (246943503).

Almost surely, 2^823145005 is an apocalyptic number.

It is an amenable number.

823145005 is a deficient number, since it is larger than the sum of its proper divisors (164629007).

823145005 is a wasteful number, since it uses less digits than its factorization.

823145005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164629006.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 823145005 is about 28690.5037425278. The cubic root of 823145005 is about 937.1852592052.

The spelling of 823145005 in words is "eight hundred twenty-three million, one hundred forty-five thousand, five".