1678039081 has 2 divisors, whose sum is σ = 1678039082. Its totient is φ = 1678039080.

The previous prime is 1678039067. The next prime is 1678039087. The reversal of 1678039081 is 1809308761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1189629081 + 488410000 = 34491^2 + 22100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678039081 - 2¹⁵ = 1678006313 is a prime.

It is a super-2 number, since 2×1678039081² = 5631630314726649122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1678039087) 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, 839019540 + 839019541.

It is an arithmetic number, because the mean of its divisors is an integer number (839019541).

Almost surely, 2^1678039081 is an apocalyptic number.

It is an amenable number.

1678039081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678039081 is an equidigital number, since it uses as much as digits as its factorization.

1678039081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1678039081 is about 40963.8753171621. The cubic root of 1678039081 is about 1188.3216886767.

The spelling of 1678039081 in words is "one billion, six hundred seventy-eight million, thirty-nine thousand, eighty-one".