1216588811 has 2 divisors, whose sum is σ = 1216588812. Its totient is φ = 1216588810.

The previous prime is 1216588783. The next prime is 1216588837. The reversal of 1216588811 is 1188856121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216588811 - 2³⁰ = 142846987 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1216588111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608294405 + 608294406.

It is an arithmetic number, because the mean of its divisors is an integer number (608294406).

Almost surely, 2^1216588811 is an apocalyptic number.

1216588811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216588811 is an equidigital number, since it uses as much as digits as its factorization.

1216588811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 41.

The square root of 1216588811 is about 34879.6331832776. The cubic root of 1216588811 is about 1067.5329106633.

The spelling of 1216588811 in words is "one billion, two hundred sixteen million, five hundred eighty-eight thousand, eight hundred eleven".