1216865033 has 2 divisors, whose sum is σ = 1216865034. Its totient is φ = 1216865032.

The previous prime is 1216865017. The next prime is 1216865093. The reversal of 1216865033 is 3305686121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 959326729 + 257538304 = 30973^2 + 16048^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216865033 - 2⁴ = 1216865017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216864984 and 1216865002.

It is not a weakly prime, because it can be changed into another prime (1216865093) 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, 608432516 + 608432517.

It is an arithmetic number, because the mean of its divisors is an integer number (608432517).

Almost surely, 2^1216865033 is an apocalyptic number.

It is an amenable number.

1216865033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216865033 is an equidigital number, since it uses as much as digits as its factorization.

1216865033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1216865033 is about 34883.5926045469. The cubic root of 1216865033 is about 1067.6136976855.

The spelling of 1216865033 in words is "one billion, two hundred sixteen million, eight hundred sixty-five thousand, thirty-three".