55605231 has 16 divisors (see below), whose sum is σ = 89867520. Its totient is φ = 33699960.

The previous prime is 55605211. The next prime is 55605233. The reversal of 55605231 is 13250655.

55605231 is a `hidden beast` number, since 55 + 605 + 2 + 3 + 1 = 666.

It is not a de Polignac number, because 55605231 - 2⁶ = 55605167 is a prime.

It is a super-2 number, since 2×55605231² = 6183883429126722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 55605195 and 55605204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55605233) 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 15 ways as a sum of consecutive naturals, for example, 93315 + ... + 93908.

It is an arithmetic number, because the mean of its divisors is an integer number (5616720).

Almost surely, 2^55605231 is an apocalyptic number.

55605231 is a deficient number, since it is larger than the sum of its proper divisors (34262289).

55605231 is a wasteful number, since it uses less digits than its factorization.

55605231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187243 (or 187237 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 55605231 is about 7456.8915105424. The cubic root of 55605231 is about 381.6851086817.

Adding to 55605231 its reverse (13250655), we get a palindrome (68855886).

The spelling of 55605231 in words is "fifty-five million, six hundred five thousand, two hundred thirty-one".