1216826893 has 2 divisors, whose sum is σ = 1216826894. Its totient is φ = 1216826892.

The previous prime is 1216826887. The next prime is 1216826903. The reversal of 1216826893 is 3986286121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1126139364 + 90687529 = 33558^2 + 9523^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216826893 - 2²¹ = 1214729741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216826803) 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, 608413446 + 608413447.

It is an arithmetic number, because the mean of its divisors is an integer number (608413447).

Almost surely, 2^1216826893 is an apocalyptic number.

It is an amenable number.

1216826893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216826893 is an equidigital number, since it uses as much as digits as its factorization.

1216826893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 1216826893 is about 34883.0459249189. The cubic root of 1216826893 is about 1067.6025435556.

The spelling of 1216826893 in words is "one billion, two hundred sixteen million, eight hundred twenty-six thousand, eight hundred ninety-three".