1681536089 has 2 divisors, whose sum is σ = 1681536090. Its totient is φ = 1681536088.

The previous prime is 1681536023. The next prime is 1681536091. The reversal of 1681536089 is 9806351861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1670111689 + 11424400 = 40867^2 + 3380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681536089 is a prime.

It is a Sophie Germain prime.

Together with 1681536091, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1681526089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840768044 + 840768045.

It is an arithmetic number, because the mean of its divisors is an integer number (840768045).

Almost surely, 2^1681536089 is an apocalyptic number.

It is an amenable number.

1681536089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681536089 is an equidigital number, since it uses as much as digits as its factorization.

1681536089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 1681536089 is about 41006.5371495814. The cubic root of 1681536089 is about 1189.1465973694.

The spelling of 1681536089 in words is "one billion, six hundred eighty-one million, five hundred thirty-six thousand, eighty-nine".