1321660523 has 8 divisors (see below), whose sum is σ = 1405146528. Its totient is φ = 1240343104.

The previous prime is 1321660517. The next prime is 1321660537. The reversal of 1321660523 is 3250661231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321660523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321660553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540890 + ... + 543327.

It is an arithmetic number, because the mean of its divisors is an integer number (175643316).

Almost surely, 2^1321660523 is an apocalyptic number.

1321660523 is a deficient number, since it is larger than the sum of its proper divisors (83486005).

1321660523 is a wasteful number, since it uses less digits than its factorization.

1321660523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084293.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1321660523 is about 36354.6492625084. The cubic root of 1321660523 is about 1097.4210999331.

The spelling of 1321660523 in words is "one billion, three hundred twenty-one million, six hundred sixty thousand, five hundred twenty-three".