1686790841 has 2 divisors, whose sum is σ = 1686790842. Its totient is φ = 1686790840.

The previous prime is 1686790801. The next prime is 1686790913. The reversal of 1686790841 is 1480976861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1168272400 + 518518441 = 34180^2 + 22771^2 .

It is a cyclic number.

It is not a de Polignac number, because 1686790841 - 2¹⁰ = 1686789817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1686790841.

It is not a weakly prime, because it can be changed into another prime (1686790801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843395420 + 843395421.

It is an arithmetic number, because the mean of its divisors is an integer number (843395421).

Almost surely, 2^1686790841 is an apocalyptic number.

It is an amenable number.

1686790841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686790841 is an equidigital number, since it uses as much as digits as its factorization.

1686790841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 1686790841 is about 41070.5592973848. The cubic root of 1686790841 is about 1190.3839923138.

The spelling of 1686790841 in words is "one billion, six hundred eighty-six million, seven hundred ninety thousand, eight hundred forty-one".