1216065839 has 2 divisors, whose sum is σ = 1216065840. Its totient is φ = 1216065838.

The previous prime is 1216065833. The next prime is 1216065847. The reversal of 1216065839 is 9385606121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216065839 - 2⁸ = 1216065583 is a prime.

It is a super-2 number, since 2×1216065839² = 2957632249565547842, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1216065796 and 1216065805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216065833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608032919 + 608032920.

It is an arithmetic number, because the mean of its divisors is an integer number (608032920).

Almost surely, 2^1216065839 is an apocalyptic number.

1216065839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216065839 is an equidigital number, since it uses as much as digits as its factorization.

1216065839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 1216065839 is about 34872.1355669537. The cubic root of 1216065839 is about 1067.3799228359.

The spelling of 1216065839 in words is "one billion, two hundred sixteen million, sixty-five thousand, eight hundred thirty-nine".