1216640617 has 2 divisors, whose sum is σ = 1216640618. Its totient is φ = 1216640616.

The previous prime is 1216640609. The next prime is 1216640627. The reversal of 1216640617 is 7160466121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058786521 + 157854096 = 32539^2 + 12564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216640617 - 2³ = 1216640609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216640627) 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, 608320308 + 608320309.

It is an arithmetic number, because the mean of its divisors is an integer number (608320309).

Almost surely, 2^1216640617 is an apocalyptic number.

It is an amenable number.

1216640617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216640617 is an equidigital number, since it uses as much as digits as its factorization.

1216640617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 1216640617 is about 34880.3758150625. The cubic root of 1216640617 is about 1067.5480633658.

The spelling of 1216640617 in words is "one billion, two hundred sixteen million, six hundred forty thousand, six hundred seventeen".