10820309561 has 2 divisors, whose sum is σ = 10820309562. Its totient is φ = 10820309560.

The previous prime is 10820309459. The next prime is 10820309569. The reversal of 10820309561 is 16590302801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9405120400 + 1415189161 = 96980^2 + 37619^2 .

It is an emirp because it is prime and its reverse (16590302801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10820309561 - 2¹⁴ = 10820293177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (10820309569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5410154780 + 5410154781.

It is an arithmetic number, because the mean of its divisors is an integer number (5410154781).

Almost surely, 2^10820309561 is an apocalyptic number.

It is an amenable number.

10820309561 is a deficient number, since it is larger than the sum of its proper divisors (1).

10820309561 is an equidigital number, since it uses as much as digits as its factorization.

10820309561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 10820309561 in words is "ten billion, eight hundred twenty million, three hundred nine thousand, five hundred sixty-one".