1217617913 has 2 divisors, whose sum is σ = 1217617914. Its totient is φ = 1217617912.

The previous prime is 1217617901. The next prime is 1217617937. The reversal of 1217617913 is 3197167121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1204922944 + 12694969 = 34712^2 + 3563^2 .

It is an emirp because it is prime and its reverse (3197167121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1217617913 - 2⁸ = 1217617657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1217617943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608808956 + 608808957.

It is an arithmetic number, because the mean of its divisors is an integer number (608808957).

Almost surely, 2^1217617913 is an apocalyptic number.

It is an amenable number.

1217617913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217617913 is an equidigital number, since it uses as much as digits as its factorization.

1217617913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 38.

The square root of 1217617913 is about 34894.3822556010. The cubic root of 1217617913 is about 1067.8338314630.

The spelling of 1217617913 in words is "one billion, two hundred seventeen million, six hundred seventeen thousand, nine hundred thirteen".