1670393917 has 2 divisors, whose sum is σ = 1670393918. Its totient is φ = 1670393916.

The previous prime is 1670393909. The next prime is 1670393981. The reversal of 1670393917 is 7193930761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1160492356 + 509901561 = 34066^2 + 22581^2 .

It is an emirp because it is prime and its reverse (7193930761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1670393917 - 2³ = 1670393909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670393017) 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, 835196958 + 835196959.

It is an arithmetic number, because the mean of its divisors is an integer number (835196959).

Almost surely, 2^1670393917 is an apocalyptic number.

It is an amenable number.

1670393917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670393917 is an equidigital number, since it uses as much as digits as its factorization.

1670393917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 214326, while the sum is 46.

The square root of 1670393917 is about 40870.4528602265. The cubic root of 1670393917 is about 1186.5142722475.

The spelling of 1670393917 in words is "one billion, six hundred seventy million, three hundred ninety-three thousand, nine hundred seventeen".