11227511261 has 2 divisors, whose sum is σ = 11227511262. Its totient is φ = 11227511260.

The previous prime is 11227511233. The next prime is 11227511353. The reversal of 11227511261 is 16211572211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7674636025 + 3552875236 = 87605^2 + 59606^2 .

It is an emirp because it is prime and its reverse (16211572211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11227511261 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 (11227511201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5613755630 + 5613755631.

It is an arithmetic number, because the mean of its divisors is an integer number (5613755631).

Almost surely, 2^11227511261 is an apocalyptic number.

It is an amenable number.

11227511261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11227511261 is an equidigital number, since it uses as much as digits as its factorization.

11227511261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 29.

The spelling of 11227511261 in words is "eleven billion, two hundred twenty-seven million, five hundred eleven thousand, two hundred sixty-one".