1216370365 has 12 divisors (see below), whose sum is σ = 1697954076. Its totient is φ = 834082368.

The previous prime is 1216370339. The next prime is 1216370377. The reversal of 1216370365 is 5630736121.

It can be written as a sum of positive squares in 2 ways, for example, as 769174756 + 447195609 = 27734^2 + 21147^2 .

It is not a de Polignac number, because 1216370365 - 2⁷ = 1216370237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216370365.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2482144 + ... + 2482633.

It is an arithmetic number, because the mean of its divisors is an integer number (141496173).

Almost surely, 2^1216370365 is an apocalyptic number.

It is an amenable number.

1216370365 is a deficient number, since it is larger than the sum of its proper divisors (481583711).

1216370365 is an equidigital number, since it uses as much as digits as its factorization.

1216370365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4964796 (or 4964789 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 1216370365 is about 34876.5016164179. The cubic root of 1216370365 is about 1067.4690128065.

It can be divided in two parts, 12163 and 70365, that added together give a palindrome (82528).

The spelling of 1216370365 in words is "one billion, two hundred sixteen million, three hundred seventy thousand, three hundred sixty-five".