1323545521 has 8 divisors (see below), whose sum is σ = 1377212544. Its totient is φ = 1270941360.

The previous prime is 1323545513. The next prime is 1323545551. The reversal of 1323545521 is 1255453231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1323545521 - 2³ = 1323545513 is a prime.

It is a super-2 number, since 2×1323545521² = 3503545492318322882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1323545501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263175 + ... + 268156.

It is an arithmetic number, because the mean of its divisors is an integer number (172151568).

Almost surely, 2^1323545521 is an apocalyptic number.

It is an amenable number.

1323545521 is a deficient number, since it is larger than the sum of its proper divisors (53667023).

1323545521 is an equidigital number, since it uses as much as digits as its factorization.

1323545521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531431.

The product of its digits is 18000, while the sum is 31.

The square root of 1323545521 is about 36380.5651550385. The cubic root of 1323545521 is about 1097.9425787515.

Adding to 1323545521 its reverse (1255453231), we get a palindrome (2578998752).

The spelling of 1323545521 in words is "one billion, three hundred twenty-three million, five hundred forty-five thousand, five hundred twenty-one".