1216717511 has 2 divisors, whose sum is σ = 1216717512. Its totient is φ = 1216717510.

The previous prime is 1216717483. The next prime is 1216717519. The reversal of 1216717511 is 1157176121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216717511 - 2¹⁸ = 1216455367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216717519) 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, 608358755 + 608358756.

It is an arithmetic number, because the mean of its divisors is an integer number (608358756).

Almost surely, 2^1216717511 is an apocalyptic number.

1216717511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216717511 is an equidigital number, since it uses as much as digits as its factorization.

1216717511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2940, while the sum is 32.

The square root of 1216717511 is about 34881.4780506790. The cubic root of 1216717511 is about 1067.5705532478.

The spelling of 1216717511 in words is "one billion, two hundred sixteen million, seven hundred seventeen thousand, five hundred eleven".