1321613316 has 81 divisors (see below), whose sum is σ = 3428435829. Its totient is φ = 429268032.

The previous prime is 1321613287. The next prime is 1321613333. The reversal of 1321613316 is 6133161231.

The square root of 1321613316 is 36354.

It is a perfect power (a square), and thus also a powerful number.

1321613316 is a `hidden beast` number, since 1 + 32 + 1 + 613 + 3 + 16 = 666.

It can be written as a sum of positive squares in only one way, i.e., 750212100 + 571401216 = 27390^2 + 23904^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1321613316.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 15923011 + ... + 15923093.

Almost surely, 2^1321613316 is an apocalyptic number.

1321613316 is the 36354-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321613316

1321613316 is an abundant number, since it is smaller than the sum of its proper divisors (2106822513).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321613316 is an equidigital number, since it uses as much as digits as its factorization.

1321613316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 161 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The cubic root of 1321613316 is about 1097.4080339015.

Adding to 1321613316 its reverse (6133161231), we get a palindrome (7454774547).

The spelling of 1321613316 in words is "one billion, three hundred twenty-one million, six hundred thirteen thousand, three hundred sixteen".