1316544821 has 16 divisors (see below), whose sum is σ = 1425729600. Its totient is φ = 1211129088.

The previous prime is 1316544781. The next prime is 1316544851. The reversal of 1316544821 is 1284456131.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1316544821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316544851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175871 + ... + 183203.

It is an arithmetic number, because the mean of its divisors is an integer number (89108100).

Almost surely, 2^1316544821 is an apocalyptic number.

It is an amenable number.

1316544821 is a deficient number, since it is larger than the sum of its proper divisors (109184779).

1316544821 is a wasteful number, since it uses less digits than its factorization.

1316544821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7588.

The product of its digits is 23040, while the sum is 35.

The square root of 1316544821 is about 36284.2227559032. Note that the first 3 decimals coincide. The cubic root of 1316544821 is about 1096.0033535359.

The spelling of 1316544821 in words is "one billion, three hundred sixteen million, five hundred forty-four thousand, eight hundred twenty-one".