1216530707 has 8 divisors (see below), whose sum is σ = 1392020832. Its totient is φ = 1041465600.

The previous prime is 1216530701. The next prime is 1216530709. The reversal of 1216530707 is 7070356121.

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

It is not a de Polignac number, because 1216530707 - 2⁴ = 1216530691 is a prime.

It is a super-2 number, since 2×1216530707² = 2959893922147839698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216530701) 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, 100094 + ... + 111587.

It is an arithmetic number, because the mean of its divisors is an integer number (174002604).

Almost surely, 2^1216530707 is an apocalyptic number.

1216530707 is a deficient number, since it is larger than the sum of its proper divisors (175490125).

1216530707 is an equidigital number, since it uses as much as digits as its factorization.

1216530707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212509.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 1216530707 is about 34878.8002517288. The cubic root of 1216530707 is about 1067.5159153512.

Adding to 1216530707 its reverse (7070356121), we get a palindrome (8286886828).

The spelling of 1216530707 in words is "one billion, two hundred sixteen million, five hundred thirty thousand, seven hundred seven".