1216743247 has 2 divisors, whose sum is σ = 1216743248. Its totient is φ = 1216743246.

The previous prime is 1216743239. The next prime is 1216743251. The reversal of 1216743247 is 7423476121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216743247 - 2³ = 1216743239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216743277) 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, 608371623 + 608371624.

It is an arithmetic number, because the mean of its divisors is an integer number (608371624).

Almost surely, 2^1216743247 is an apocalyptic number.

1216743247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216743247 is an equidigital number, since it uses as much as digits as its factorization.

1216743247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 37.

The square root of 1216743247 is about 34881.8469551141. The cubic root of 1216743247 is about 1067.5780802762.

The spelling of 1216743247 in words is "one billion, two hundred sixteen million, seven hundred forty-three thousand, two hundred forty-seven".