1323005531 has 4 divisors (see below), whose sum is σ = 1329654000. Its totient is φ = 1316357064.

The previous prime is 1323005513. The next prime is 1323005539. The reversal of 1323005531 is 1355003231.

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 1323005531 - 2²⁶ = 1255896667 is a prime.

It is a super-2 number, since 2×1323005531² = 3500687270113183922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323005497 and 1323005506.

It is not an unprimeable number, because it can be changed into a prime (1323005539) 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, 3323936 + ... + 3324333.

It is an arithmetic number, because the mean of its divisors is an integer number (332413500).

Almost surely, 2^1323005531 is an apocalyptic number.

1323005531 is a deficient number, since it is larger than the sum of its proper divisors (6648469).

1323005531 is an equidigital number, since it uses as much as digits as its factorization.

1323005531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6648468.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 1323005531 is about 36373.1429903988. The cubic root of 1323005531 is about 1097.7932428324.

Adding to 1323005531 its reverse (1355003231), we get a palindrome (2678008762).

The spelling of 1323005531 in words is "one billion, three hundred twenty-three million, five thousand, five hundred thirty-one".