1217160805 has 32 divisors (see below), whose sum is σ = 1833523200. Its totient is φ = 756309312.

The previous prime is 1217160803. The next prime is 1217160811. The reversal of 1217160805 is 5080617121.

It is a cyclic number.

It is not a de Polignac number, because 1217160805 - 2¹ = 1217160803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217160803) 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 in 31 ways as a sum of consecutive naturals, for example, 24495 + ... + 55084.

It is an arithmetic number, because the mean of its divisors is an integer number (57297600).

Almost surely, 2^1217160805 is an apocalyptic number.

It is an amenable number.

1217160805 is a deficient number, since it is larger than the sum of its proper divisors (616362395).

1217160805 is a wasteful number, since it uses less digits than its factorization.

1217160805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79633.

The product of its (nonzero) digits is 3360, while the sum is 31.

The square root of 1217160805 is about 34887.8317612316. The cubic root of 1217160805 is about 1067.7001889697.

Adding to 1217160805 its reverse (5080617121), we get a palindrome (6297777926).

The spelling of 1217160805 in words is "one billion, two hundred seventeen million, one hundred sixty thousand, eight hundred five".