11551311 has 6 divisors (see below), whose sum is σ = 16685240. Its totient is φ = 7700868.

The previous prime is 11551307. The next prime is 11551327. The reversal of 11551311 is 11315511.

11551311 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11551311 - 2² = 11551307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 641731 + ... + 641748.

Almost surely, 2^11551311 is an apocalyptic number.

11551311 is a deficient number, since it is larger than the sum of its proper divisors (5133929).

11551311 is a wasteful number, since it uses less digits than its factorization.

11551311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283485 (or 1283482 counting only the distinct ones).

The product of its digits is 75, while the sum is 18.

The square root of 11551311 is about 3398.7219656806. The cubic root of 11551311 is about 226.0530783520.

Adding to 11551311 its reverse (11315511), we get a palindrome (22866822).

The spelling of 11551311 in words is "eleven million, five hundred fifty-one thousand, three hundred eleven".