1678258993 has 2 divisors, whose sum is σ = 1678258994. Its totient is φ = 1678258992.

The previous prime is 1678258991. The next prime is 1678259017. The reversal of 1678258993 is 3998528761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1676738704 + 1520289 = 40948^2 + 1233^2 .

It is an emirp because it is prime and its reverse (3998528761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1678258993 - 2¹ = 1678258991 is a prime.

Together with 1678258991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1678258991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839129496 + 839129497.

It is an arithmetic number, because the mean of its divisors is an integer number (839129497).

Almost surely, 2^1678258993 is an apocalyptic number.

It is an amenable number.

1678258993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678258993 is an equidigital number, since it uses as much as digits as its factorization.

1678258993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 58.

The square root of 1678258993 is about 40966.5594479204. The cubic root of 1678258993 is about 1188.3735974368.

The spelling of 1678258993 in words is "one billion, six hundred seventy-eight million, two hundred fifty-eight thousand, nine hundred ninety-three".