11261984861 has 2 divisors, whose sum is σ = 11261984862. Its totient is φ = 11261984860.

The previous prime is 11261984821. The next prime is 11261984869. The reversal of 11261984861 is 16848916211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8794875961 + 2467108900 = 93781^2 + 49670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11261984861 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 (11261984869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5630992430 + 5630992431.

It is an arithmetic number, because the mean of its divisors is an integer number (5630992431).

Almost surely, 2^11261984861 is an apocalyptic number.

It is an amenable number.

11261984861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11261984861 is an equidigital number, since it uses as much as digits as its factorization.

11261984861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 47.

The spelling of 11261984861 in words is "eleven billion, two hundred sixty-one million, nine hundred eighty-four thousand, eight hundred sixty-one".