1678085291 has 2 divisors, whose sum is σ = 1678085292. Its totient is φ = 1678085290.

The previous prime is 1678085243. The next prime is 1678085303. The reversal of 1678085291 is 1925808761.

It is a strong prime.

It is an emirp because it is prime and its reverse (1925808761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1678085291 is a prime.

It is a super-4 number, since 4×1678085291⁴ (a number of 38 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (1678081291) 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, 839042645 + 839042646.

It is an arithmetic number, because the mean of its divisors is an integer number (839042646).

Almost surely, 2^1678085291 is an apocalyptic number.

1678085291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678085291 is an equidigital number, since it uses as much as digits as its factorization.

1678085291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 47.

The square root of 1678085291 is about 40964.4393468286. The cubic root of 1678085291 is about 1188.3325966152.

The spelling of 1678085291 in words is "one billion, six hundred seventy-eight million, eighty-five thousand, two hundred ninety-one".