1323521687 has 4 divisors (see below), whose sum is σ = 1324722720. Its totient is φ = 1322320656.

The previous prime is 1323521669. The next prime is 1323521701. The reversal of 1323521687 is 7861253231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7861253231 = 13 ⋅604711787.

It is a cyclic number.

It is not a de Polignac number, because 1323521687 - 2⁶ = 1323521623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1323521687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323521887) 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, 598862 + ... + 601067.

It is an arithmetic number, because the mean of its divisors is an integer number (331180680).

Almost surely, 2^1323521687 is an apocalyptic number.

1323521687 is a deficient number, since it is larger than the sum of its proper divisors (1201033).

1323521687 is a wasteful number, since it uses less digits than its factorization.

1323521687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201032.

The product of its digits is 60480, while the sum is 38.

The square root of 1323521687 is about 36380.2375885590. The cubic root of 1323521687 is about 1097.9359882413.

The spelling of 1323521687 in words is "one billion, three hundred twenty-three million, five hundred twenty-one thousand, six hundred eighty-seven".