1678881349 has 2 divisors, whose sum is σ = 1678881350. Its totient is φ = 1678881348.

The previous prime is 1678881299. The next prime is 1678881361. The reversal of 1678881349 is 9431888761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1584597249 + 94284100 = 39807^2 + 9710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678881349 - 2⁷ = 1678881221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1678881349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1678881749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839440674 + 839440675.

It is an arithmetic number, because the mean of its divisors is an integer number (839440675).

Almost surely, 2^1678881349 is an apocalyptic number.

It is an amenable number.

1678881349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678881349 is an equidigital number, since it uses as much as digits as its factorization.

1678881349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 55.

The square root of 1678881349 is about 40974.1546465574. The cubic root of 1678881349 is about 1188.5204758464.

The spelling of 1678881349 in words is "one billion, six hundred seventy-eight million, eight hundred eighty-one thousand, three hundred forty-nine".