1213308917 has 2 divisors, whose sum is σ = 1213308918. Its totient is φ = 1213308916.

The previous prime is 1213308809. The next prime is 1213308923. The reversal of 1213308917 is 7198033121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 890962801 + 322346116 = 29849^2 + 17954^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213308917 - 2⁸ = 1213308661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213308977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606654458 + 606654459.

It is an arithmetic number, because the mean of its divisors is an integer number (606654459).

Almost surely, 2^1213308917 is an apocalyptic number.

It is an amenable number.

1213308917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213308917 is an equidigital number, since it uses as much as digits as its factorization.

1213308917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1213308917 is about 34832.5841275091. The cubic root of 1213308917 is about 1066.5726996108.

The spelling of 1213308917 in words is "one billion, two hundred thirteen million, three hundred eight thousand, nine hundred seventeen".