1681624559 has 2 divisors, whose sum is σ = 1681624560. Its totient is φ = 1681624558.

The previous prime is 1681624541. The next prime is 1681624561. The reversal of 1681624559 is 9554261861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1681624559 - 2¹² = 1681620463 is a prime.

It is a super-2 number, since 2×1681624559² = 5655722314863888962, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1681624561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681624589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840812279 + 840812280.

It is an arithmetic number, because the mean of its divisors is an integer number (840812280).

Almost surely, 2^1681624559 is an apocalyptic number.

1681624559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681624559 is an equidigital number, since it uses as much as digits as its factorization.

1681624559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 47.

The square root of 1681624559 is about 41007.6158658364. The cubic root of 1681624559 is about 1189.1674517052.

The spelling of 1681624559 in words is "one billion, six hundred eighty-one million, six hundred twenty-four thousand, five hundred fifty-nine".