1216564519 has 2 divisors, whose sum is σ = 1216564520. Its totient is φ = 1216564518.

The previous prime is 1216564457. The next prime is 1216564549. The reversal of 1216564519 is 9154656121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216564519 is a prime.

It is a super-2 number, since 2×1216564519² = 2960058457779402722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216564549) 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 as a sum of consecutive naturals, namely, 608282259 + 608282260.

It is an arithmetic number, because the mean of its divisors is an integer number (608282260).

Almost surely, 2^1216564519 is an apocalyptic number.

1216564519 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216564519 is an equidigital number, since it uses as much as digits as its factorization.

1216564519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 40.

The square root of 1216564519 is about 34879.2849554001. The cubic root of 1216564519 is about 1067.5258053643.

The spelling of 1216564519 in words is "one billion, two hundred sixteen million, five hundred sixty-four thousand, five hundred nineteen".