55643237 has 4 divisors (see below), whose sum is σ = 59923500. Its totient is φ = 51362976.

The previous prime is 55643221. The next prime is 55643239. The reversal of 55643237 is 73234655.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13315201 + 42328036 = 3649^2 + 6506^2 .

It is a cyclic number.

It is not a de Polignac number, because 55643237 - 2⁴ = 55643221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55643197 and 55643206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55643239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2140112 + ... + 2140137.

It is an arithmetic number, because the mean of its divisors is an integer number (14980875).

Almost surely, 2^55643237 is an apocalyptic number.

It is an amenable number.

55643237 is a deficient number, since it is larger than the sum of its proper divisors (4280263).

55643237 is a wasteful number, since it uses less digits than its factorization.

55643237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4280262.

The product of its digits is 75600, while the sum is 35.

The square root of 55643237 is about 7459.4394561522. The cubic root of 55643237 is about 381.7720490662.

The spelling of 55643237 in words is "fifty-five million, six hundred forty-three thousand, two hundred thirty-seven".