1216836349 has 2 divisors, whose sum is σ = 1216836350. Its totient is φ = 1216836348.

The previous prime is 1216836287. The next prime is 1216836373. The reversal of 1216836349 is 9436386121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1025152324 + 191684025 = 32018^2 + 13845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216836349 - 2¹¹ = 1216834301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216836389) 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, 608418174 + 608418175.

It is an arithmetic number, because the mean of its divisors is an integer number (608418175).

Almost surely, 2^1216836349 is an apocalyptic number.

It is an amenable number.

1216836349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216836349 is an equidigital number, since it uses as much as digits as its factorization.

1216836349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 43.

The square root of 1216836349 is about 34883.1814632783. The cubic root of 1216836349 is about 1067.6053090061.

The spelling of 1216836349 in words is "one billion, two hundred sixteen million, eight hundred thirty-six thousand, three hundred forty-nine".