1216599871 has 2 divisors, whose sum is σ = 1216599872. Its totient is φ = 1216599870.

The previous prime is 1216599859. The next prime is 1216599893. The reversal of 1216599871 is 1789956121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216599871 - 2⁹ = 1216599359 is a prime.

It is a super-2 number, since 2×1216599871² = 2960230492234433282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216599821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608299935 + 608299936.

It is an arithmetic number, because the mean of its divisors is an integer number (608299936).

Almost surely, 2^1216599871 is an apocalyptic number.

1216599871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216599871 is an equidigital number, since it uses as much as digits as its factorization.

1216599871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 49.

The square root of 1216599871 is about 34879.7917281626. The cubic root of 1216599871 is about 1067.5361456315.

The spelling of 1216599871 in words is "one billion, two hundred sixteen million, five hundred ninety-nine thousand, eight hundred seventy-one".