1216454783 has 2 divisors, whose sum is σ = 1216454784. Its totient is φ = 1216454782.

The previous prime is 1216454777. The next prime is 1216454867. The reversal of 1216454783 is 3874546121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216454783 - 2⁸ = 1216454527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216454783.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216450783) 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, 608227391 + 608227392.

It is an arithmetic number, because the mean of its divisors is an integer number (608227392).

Almost surely, 2^1216454783 is an apocalyptic number.

1216454783 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216454783 is an equidigital number, since it uses as much as digits as its factorization.

1216454783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 41.

The square root of 1216454783 is about 34877.7118372178. The cubic root of 1216454783 is about 1067.4937069066.

The spelling of 1216454783 in words is "one billion, two hundred sixteen million, four hundred fifty-four thousand, seven hundred eighty-three".