1216575533 has 2 divisors, whose sum is σ = 1216575534. Its totient is φ = 1216575532.

The previous prime is 1216575527. The next prime is 1216575541. The reversal of 1216575533 is 3355756121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1211179204 + 5396329 = 34802^2 + 2323^2 .

It is an emirp because it is prime and its reverse (3355756121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216575533 is a prime.

It is a super-3 number, since 3×1216575533³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216575523) 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, 608287766 + 608287767.

It is an arithmetic number, because the mean of its divisors is an integer number (608287767).

Almost surely, 2^1216575533 is an apocalyptic number.

It is an amenable number.

1216575533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216575533 is an equidigital number, since it uses as much as digits as its factorization.

1216575533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94500, while the sum is 38.

The square root of 1216575533 is about 34879.4428424538. The cubic root of 1216575533 is about 1067.5290269207.

The spelling of 1216575533 in words is "one billion, two hundred sixteen million, five hundred seventy-five thousand, five hundred thirty-three".