1216161842 has 16 divisors (see below), whose sum is σ = 2194578240. Its totient is φ = 493779888.

The previous prime is 1216161829. The next prime is 1216161853. The reversal of 1216161842 is 2481616121.

It is a junction number, because it is equal to n+sod(n) for n = 1216161799 and 1216161808.

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 7 ways as a sum of consecutive naturals, for example, 2285753 + ... + 2286284.

It is an arithmetic number, because the mean of its divisors is an integer number (137161140).

Almost surely, 2^1216161842 is an apocalyptic number.

1216161842 is a deficient number, since it is larger than the sum of its proper divisors (978416398).

1216161842 is a wasteful number, since it uses less digits than its factorization.

1216161842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4572065.

The product of its digits is 4608, while the sum is 32.

The square root of 1216161842 is about 34873.5120399423. The cubic root of 1216161842 is about 1067.4080103991.

Adding to 1216161842 its reverse (2481616121), we get a palindrome (3697777963).

The spelling of 1216161842 in words is "one billion, two hundred sixteen million, one hundred sixty-one thousand, eight hundred forty-two".