1216713601 has 8 divisors (see below), whose sum is σ = 1230219144. Its totient is φ = 1203256320.

The previous prime is 1216713599. The next prime is 1216713607. The reversal of 1216713601 is 1063176121.

It can be written as a sum of positive squares in 4 ways, for example, as 16160400 + 1200553201 = 4020^2 + 34649^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1216713601 - 2¹ = 1216713599 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 1216713601.

It is not an unprimeable number, because it can be changed into a prime (1216713607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39861 + ... + 63421.

It is an arithmetic number, because the mean of its divisors is an integer number (153777393).

Almost surely, 2^1216713601 is an apocalyptic number.

It is an amenable number.

1216713601 is a deficient number, since it is larger than the sum of its proper divisors (13505543).

1216713601 is a wasteful number, since it uses less digits than its factorization.

1216713601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24131.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1216713601 is about 34881.4220036970. The cubic root of 1216713601 is about 1067.5694096777.

Adding to 1216713601 its reverse (1063176121), we get a palindrome (2279889722).

The spelling of 1216713601 in words is "one billion, two hundred sixteen million, seven hundred thirteen thousand, six hundred one".