1216512442 has 8 divisors (see below), whose sum is σ = 1849765716. Its totient is φ = 599923872.

The previous prime is 1216512433. The next prime is 1216512457. The reversal of 1216512442 is 2442156121.

It can be written as a sum of positive squares in 2 ways, for example, as 1208327121 + 8185321 = 34761^2 + 2861^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1216512442.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4165993 + ... + 4166284.

Almost surely, 2^1216512442 is an apocalyptic number.

1216512442 is a deficient number, since it is larger than the sum of its proper divisors (633253274).

1216512442 is an equidigital number, since it uses as much as digits as its factorization.

1216512442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332352.

The product of its digits is 3840, while the sum is 28.

The square root of 1216512442 is about 34878.5384154784. The cubic root of 1216512442 is about 1067.5105727608.

Adding to 1216512442 its reverse (2442156121), we get a palindrome (3658668563).

The spelling of 1216512442 in words is "one billion, two hundred sixteen million, five hundred twelve thousand, four hundred forty-two".