1641068861 has 2 divisors, whose sum is σ = 1641068862. Its totient is φ = 1641068860.

The previous prime is 1641068843. The next prime is 1641068887. The reversal of 1641068861 is 1688601461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1607208100 + 33860761 = 40090^2 + 5819^2 .

It is an emirp because it is prime and its reverse (1688601461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1641068861 - 2⁶ = 1641068797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641068801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820534430 + 820534431.

It is an arithmetic number, because the mean of its divisors is an integer number (820534431).

Almost surely, 2^1641068861 is an apocalyptic number.

It is an amenable number.

1641068861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641068861 is an equidigital number, since it uses as much as digits as its factorization.

1641068861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 1641068861 is about 40510.1081336498. The cubic root of 1641068861 is about 1179.5298474122.

The spelling of 1641068861 in words is "one billion, six hundred forty-one million, sixty-eight thousand, eight hundred sixty-one".