11071205261 has 2 divisors, whose sum is σ = 11071205262. Its totient is φ = 11071205260.

The previous prime is 11071205219. The next prime is 11071205263. The reversal of 11071205261 is 16250217011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9222721225 + 1848484036 = 96035^2 + 42994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11071205261 is a prime.

Together with 11071205263, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11071205261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11071205263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5535602630 + 5535602631.

It is an arithmetic number, because the mean of its divisors is an integer number (5535602631).

Almost surely, 2^11071205261 is an apocalyptic number.

It is an amenable number.

11071205261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11071205261 is an equidigital number, since it uses as much as digits as its factorization.

11071205261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 26.

The spelling of 11071205261 in words is "eleven billion, seventy-one million, two hundred five thousand, two hundred sixty-one".