1216061835 has 16 divisors (see below), whose sum is σ = 1946137344. Its totient is φ = 648420192.

The previous prime is 1216061827. The next prime is 1216061849. The reversal of 1216061835 is 5381606121.

It is not a de Polignac number, because 1216061835 - 2³ = 1216061827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216061796 and 1216061805.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108714 + ... + 119376.

It is an arithmetic number, because the mean of its divisors is an integer number (121633584).

Almost surely, 2^1216061835 is an apocalyptic number.

1216061835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216061835 is a deficient number, since it is larger than the sum of its proper divisors (730075509).

1216061835 is a wasteful number, since it uses less digits than its factorization.

1216061835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18274.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1216061835 is about 34872.0781571733. The cubic root of 1216061835 is about 1067.3787513549.

Adding to 1216061835 its reverse (5381606121), we get a palindrome (6597667956).

The spelling of 1216061835 in words is "one billion, two hundred sixteen million, sixty-one thousand, eight hundred thirty-five".