323243445521 has 4 divisors (see below), whose sum is σ = 323251808292. Its totient is φ = 323235082752.

The previous prime is 323243445509. The next prime is 323243445541. The reversal of 323243445521 is 125544342323.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125544342323 = 8599 ⋅14599877.

It can be written as a sum of positive squares in 2 ways, for example, as 69392730625 + 253850714896 = 263425^2 + 503836^2 .

It is a cyclic number.

It is not a de Polignac number, because 323243445521 - 2¹⁸ = 323243183377 is a prime.

It is a super-2 number, since 2×323243445521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (323243445541) 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, 4123136 + ... + 4200801.

It is an arithmetic number, because the mean of its divisors is an integer number (80812952073).

Almost surely, 2^323243445521 is an apocalyptic number.

It is an amenable number.

323243445521 is a deficient number, since it is larger than the sum of its proper divisors (8362771).

323243445521 is an equidigital number, since it uses as much as digits as its factorization.

323243445521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8362770.

The product of its digits is 345600, while the sum is 38.

Adding to 323243445521 its reverse (125544342323), we get a palindrome (448787787844).

The spelling of 323243445521 in words is "three hundred twenty-three billion, two hundred forty-three million, four hundred forty-five thousand, five hundred twenty-one".