55011231 has 40 divisors (see below), whose sum is σ = 92782800. Its totient is φ = 32175360.

The previous prime is 55011227. The next prime is 55011277. The reversal of 55011231 is 13211055.

55011231 is a `hidden beast` number, since 550 + 112 + 3 + 1 = 666.

It is not a de Polignac number, because 55011231 - 2² = 55011227 is a prime.

It is a super-2 number, since 2×55011231² = 6052471072270722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55011431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 24775 + ... + 26903.

It is an arithmetic number, because the mean of its divisors is an integer number (2319570).

Almost surely, 2^55011231 is an apocalyptic number.

55011231 is a deficient number, since it is larger than the sum of its proper divisors (37771569).

55011231 is a wasteful number, since it uses less digits than its factorization.

55011231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181 (or 2172 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 55011231 is about 7416.9556423104. The cubic root of 55011231 is about 380.3211297442.

Adding to 55011231 its reverse (13211055), we get a palindrome (68222286).

It can be divided in two parts, 550 and 11231, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 55011231 in words is "fifty-five million, eleven thousand, two hundred thirty-one".