1681984847 has 2 divisors, whose sum is σ = 1681984848. Its totient is φ = 1681984846.

The previous prime is 1681984819. The next prime is 1681984867. The reversal of 1681984847 is 7484891861.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1681984847 - 2¹⁸ = 1681722703 is a prime.

It is a super-2 number, since 2×1681984847² = 5658146051075226818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1681984792 and 1681984801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681984867) 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, 840992423 + 840992424.

It is an arithmetic number, because the mean of its divisors is an integer number (840992424).

Almost surely, 2^1681984847 is an apocalyptic number.

1681984847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681984847 is an equidigital number, since it uses as much as digits as its factorization.

1681984847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 56.

The square root of 1681984847 is about 41012.0085706613. The cubic root of 1681984847 is about 1189.2523720017.

The spelling of 1681984847 in words is "one billion, six hundred eighty-one million, nine hundred eighty-four thousand, eight hundred forty-seven".