1011982561 has 2 divisors, whose sum is σ = 1011982562. Its totient is φ = 1011982560.

The previous prime is 1011982549. The next prime is 1011982577. The reversal of 1011982561 is 1652891101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 949872400 + 62110161 = 30820^2 + 7881^2 .

It is an emirp because it is prime and its reverse (1652891101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1011982561 - 2¹¹ = 1011980513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011982501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505991280 + 505991281.

It is an arithmetic number, because the mean of its divisors is an integer number (505991281).

Almost surely, 2^1011982561 is an apocalyptic number.

It is an amenable number.

1011982561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011982561 is an equidigital number, since it uses as much as digits as its factorization.

1011982561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 34.

The square root of 1011982561 is about 31811.6733448588. The cubic root of 1011982561 is about 1003.9783388315.

The spelling of 1011982561 in words is "one billion, eleven million, nine hundred eighty-two thousand, five hundred sixty-one".