1299917 has 2 divisors, whose sum is σ = 1299918. Its totient is φ = 1299916.

The previous prime is 1299899. The next prime is 1299919. The reversal of 1299917 is 7199921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267876 + 32041 = 1126^2 + 179^2 .

It is an emirp because it is prime and its reverse (7199921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1299917 - 2⁶ = 1299853 is a prime.

Together with 1299919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299919) 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, 649958 + 649959.

It is an arithmetic number, because the mean of its divisors is an integer number (649959).

2^1299917 is an apocalyptic number.

It is an amenable number.

1299917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299917 is an equidigital number, since it uses as much as digits as its factorization.

1299917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 38.

The square root of 1299917 is about 1140.1390266104. The cubic root of 1299917 is about 109.1369655487.

The spelling of 1299917 in words is "one million, two hundred ninety-nine thousand, nine hundred seventeen".