1646140813 has 2 divisors, whose sum is σ = 1646140814. Its totient is φ = 1646140812.

The previous prime is 1646140789. The next prime is 1646140817. The reversal of 1646140813 is 3180416461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1574264329 + 71876484 = 39677^2 + 8478^2 .

It is an emirp because it is prime and its reverse (3180416461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1646140813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1646140817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823070406 + 823070407.

It is an arithmetic number, because the mean of its divisors is an integer number (823070407).

Almost surely, 2^1646140813 is an apocalyptic number.

It is an amenable number.

1646140813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646140813 is an equidigital number, since it uses as much as digits as its factorization.

1646140813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 1646140813 is about 40572.6609060831. The cubic root of 1646140813 is about 1180.7437647970.

The spelling of 1646140813 in words is "one billion, six hundred forty-six million, one hundred forty thousand, eight hundred thirteen".