1678698451 has 2 divisors, whose sum is σ = 1678698452. Its totient is φ = 1678698450.

The previous prime is 1678698449. The next prime is 1678698481. The reversal of 1678698451 is 1548968761.

It is a weak prime.

It is an emirp because it is prime and its reverse (1548968761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1678698451 - 2¹ = 1678698449 is a prime.

Together with 1678698449, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1678698392 and 1678698401.

It is not a weakly prime, because it can be changed into another prime (1678698481) 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, 839349225 + 839349226.

It is an arithmetic number, because the mean of its divisors is an integer number (839349226).

Almost surely, 2^1678698451 is an apocalyptic number.

1678698451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678698451 is an equidigital number, since it uses as much as digits as its factorization.

1678698451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 55.

The square root of 1678698451 is about 40971.9227154401. The cubic root of 1678698451 is about 1188.4773149817.

The spelling of 1678698451 in words is "one billion, six hundred seventy-eight million, six hundred ninety-eight thousand, four hundred fifty-one".