1217087819 has 2 divisors, whose sum is σ = 1217087820. Its totient is φ = 1217087818.

The previous prime is 1217087797. The next prime is 1217087821. The reversal of 1217087819 is 9187807121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1217087819 - 2¹² = 1217083723 is a prime.

It is a super-2 number, since 2×1217087819² = 2962605518316353522, which contains 22 as substring.

Together with 1217087821, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1217087819.

It is not a weakly prime, because it can be changed into another prime (1217087899) 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, 608543909 + 608543910.

It is an arithmetic number, because the mean of its divisors is an integer number (608543910).

Almost surely, 2^1217087819 is an apocalyptic number.

1217087819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217087819 is an equidigital number, since it uses as much as digits as its factorization.

1217087819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 44.

The square root of 1217087819 is about 34886.7857361494. The cubic root of 1217087819 is about 1067.6788473022.

The spelling of 1217087819 in words is "one billion, two hundred seventeen million, eighty-seven thousand, eight hundred nineteen".