11511271 has 2 divisors, whose sum is σ = 11511272. Its totient is φ = 11511270.

The previous prime is 11511263. The next prime is 11511277. The reversal of 11511271 is 17211511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11511271 - 2³ = 11511263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11511277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5755635 + 5755636.

It is an arithmetic number, because the mean of its divisors is an integer number (5755636).

Almost surely, 2^11511271 is an apocalyptic number.

11511271 is a deficient number, since it is larger than the sum of its proper divisors (1).

11511271 is an equidigital number, since it uses as much as digits as its factorization.

11511271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70, while the sum is 19.

The square root of 11511271 is about 3392.8264028683. The cubic root of 11511271 is about 225.7915887433.

Adding to 11511271 its reverse (17211511), we get a palindrome (28722782).

The spelling of 11511271 in words is "eleven million, five hundred eleven thousand, two hundred seventy-one".