55311311 has 4 divisors (see below), whose sum is σ = 60339624. Its totient is φ = 50283000.

The previous prime is 55311307. The next prime is 55311313. The reversal of 55311311 is 11311355.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55311311 - 2² = 55311307 is a prime.

It is a super-2 number, since 2×55311311² = 6118682249077442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55311313) 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 in 3 ways as a sum of consecutive naturals, for example, 2514140 + ... + 2514161.

It is an arithmetic number, because the mean of its divisors is an integer number (15084906).

Almost surely, 2^55311311 is an apocalyptic number.

55311311 is a deficient number, since it is larger than the sum of its proper divisors (5028313).

55311311 is a wasteful number, since it uses less digits than its factorization.

55311311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5028312.

The product of its digits is 225, while the sum is 20.

The square root of 55311311 is about 7437.1574542966. The cubic root of 55311311 is about 381.0114122736.

Adding to 55311311 its reverse (11311355), we get a palindrome (66622666).

The spelling of 55311311 in words is "fifty-five million, three hundred eleven thousand, three hundred eleven".