1216588801 has 4 divisors (see below), whose sum is σ = 1216928772. Its totient is φ = 1216248832.

The previous prime is 1216588783. The next prime is 1216588811. The reversal of 1216588801 is 1088856121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48316401 + 1168272400 = 6951^2 + 34180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216588801 - 2¹¹ = 1216586753 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216588811) 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, 164560 + ... + 171793.

It is an arithmetic number, because the mean of its divisors is an integer number (304232193).

Almost surely, 2^1216588801 is an apocalyptic number.

It is an amenable number.

1216588801 is a deficient number, since it is larger than the sum of its proper divisors (339971).

1216588801 is an equidigital number, since it uses as much as digits as its factorization.

1216588801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339970.

The product of its (nonzero) digits is 30720, while the sum is 40.

The square root of 1216588801 is about 34879.6330399275. The cubic root of 1216588801 is about 1067.5329077384.

The spelling of 1216588801 in words is "one billion, two hundred sixteen million, five hundred eighty-eight thousand, eight hundred one".