1216710617 has 4 divisors (see below), whose sum is σ = 1217231376. Its totient is φ = 1216189860.

The previous prime is 1216710613. The next prime is 1216710641. The reversal of 1216710617 is 7160176121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1216710617 - 2² = 1216710613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216710613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256859 + ... + 261552.

It is an arithmetic number, because the mean of its divisors is an integer number (304307844).

Almost surely, 2^1216710617 is an apocalyptic number.

It is an amenable number.

1216710617 is a deficient number, since it is larger than the sum of its proper divisors (520759).

1216710617 is an equidigital number, since it uses as much as digits as its factorization.

1216710617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520758.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 1216710617 is about 34881.3792301853. The cubic root of 1216710617 is about 1067.5685369361.

Adding to 1216710617 its reverse (7160176121), we get a palindrome (8376886738).

The spelling of 1216710617 in words is "one billion, two hundred sixteen million, seven hundred ten thousand, six hundred seventeen".