1213643773 has 2 divisors, whose sum is σ = 1213643774. Its totient is φ = 1213643772.

The previous prime is 1213643731. The next prime is 1213643779. The reversal of 1213643773 is 3773463121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 695535129 + 518108644 = 26373^2 + 22762^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213643773 - 2¹³ = 1213635581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213643779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606821886 + 606821887.

It is an arithmetic number, because the mean of its divisors is an integer number (606821887).

Almost surely, 2^1213643773 is an apocalyptic number.

It is an amenable number.

1213643773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213643773 is an equidigital number, since it uses as much as digits as its factorization.

1213643773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 37.

The square root of 1213643773 is about 34837.3904447506. The cubic root of 1213643773 is about 1066.6708102161.

The spelling of 1213643773 in words is "one billion, two hundred thirteen million, six hundred forty-three thousand, seven hundred seventy-three".