1216257719 has 2 divisors, whose sum is σ = 1216257720. Its totient is φ = 1216257718.

The previous prime is 1216257703. The next prime is 1216257769. The reversal of 1216257719 is 9177526121.

It is a weak prime.

It is an emirp because it is prime and its reverse (9177526121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216257719 - 2⁴ = 1216257703 is a prime.

It is a super-2 number, since 2×1216257719² = 2958565678054165922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216257769) 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, 608128859 + 608128860.

It is an arithmetic number, because the mean of its divisors is an integer number (608128860).

Almost surely, 2^1216257719 is an apocalyptic number.

1216257719 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216257719 is an equidigital number, since it uses as much as digits as its factorization.

1216257719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 41.

The square root of 1216257719 is about 34874.8866521456. The cubic root of 1216257719 is about 1067.4360596233.

The spelling of 1216257719 in words is "one billion, two hundred sixteen million, two hundred fifty-seven thousand, seven hundred nineteen".