1216831267 has 2 divisors, whose sum is σ = 1216831268. Its totient is φ = 1216831266.

The previous prime is 1216831241. The next prime is 1216831277. The reversal of 1216831267 is 7621386121.

It is a strong prime.

It is an emirp because it is prime and its reverse (7621386121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216831267 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216831237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608415633 + 608415634.

It is an arithmetic number, because the mean of its divisors is an integer number (608415634).

Almost surely, 2^1216831267 is an apocalyptic number.

1216831267 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216831267 is an equidigital number, since it uses as much as digits as its factorization.

1216831267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 1216831267 is about 34883.1086200757. The cubic root of 1216831267 is about 1067.6038227537.

The spelling of 1216831267 in words is "one billion, two hundred sixteen million, eight hundred thirty-one thousand, two hundred sixty-seven".