1216630365 has 16 divisors (see below), whose sum is σ = 1947988608. Its totient is φ = 648409536.

The previous prime is 1216630361. The next prime is 1216630367. The reversal of 1216630365 is 5630366121.

It is not a de Polignac number, because 1216630365 - 2² = 1216630361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216630361) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6322 + ... + 49731.

It is an arithmetic number, because the mean of its divisors is an integer number (121749288).

Almost surely, 2^1216630365 is an apocalyptic number.

1216630365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216630365 is a deficient number, since it is larger than the sum of its proper divisors (731358243).

1216630365 is a wasteful number, since it uses less digits than its factorization.

1216630365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57508.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 1216630365 is about 34880.2288553272. The cubic root of 1216630365 is about 1067.5450647993.

Adding to 1216630365 its reverse (5630366121), we get a palindrome (6846996486).

The spelling of 1216630365 in words is "one billion, two hundred sixteen million, six hundred thirty thousand, three hundred sixty-five".