1216611679 has 2 divisors, whose sum is σ = 1216611680. Its totient is φ = 1216611678.

The previous prime is 1216611653. The next prime is 1216611719. The reversal of 1216611679 is 9761166121.

It is an a-pointer prime, because the next prime (1216611719) can be obtained adding 1216611679 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216611679 - 2⁷ = 1216611551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216611619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608305839 + 608305840.

It is an arithmetic number, because the mean of its divisors is an integer number (608305840).

Almost surely, 2^1216611679 is an apocalyptic number.

1216611679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216611679 is an equidigital number, since it uses as much as digits as its factorization.

1216611679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 1216611679 is about 34879.9609948176. The cubic root of 1216611679 is about 1067.5395993625.

The spelling of 1216611679 in words is "one billion, two hundred sixteen million, six hundred eleven thousand, six hundred seventy-nine".