1216868747 has 2 divisors, whose sum is σ = 1216868748. Its totient is φ = 1216868746.

The previous prime is 1216868729. The next prime is 1216868771. The reversal of 1216868747 is 7478686121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216868747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216868695 and 1216868704.

It is not a weakly prime, because it can be changed into another prime (1216868707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608434373 + 608434374.

It is an arithmetic number, because the mean of its divisors is an integer number (608434374).

Almost surely, 2^1216868747 is an apocalyptic number.

1216868747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216868747 is an equidigital number, since it uses as much as digits as its factorization.

1216868747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 50.

The square root of 1216868747 is about 34883.6458387021. The cubic root of 1216868747 is about 1067.6147838408.

The spelling of 1216868747 in words is "one billion, two hundred sixteen million, eight hundred sixty-eight thousand, seven hundred forty-seven".