55042237 has 4 divisors (see below), whose sum is σ = 55105596. Its totient is φ = 54978880.

The previous prime is 55042177. The next prime is 55042241. The reversal of 55042237 is 73224055.

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 9803161 + 45239076 = 3131^2 + 6726^2 .

It is a cyclic number.

It is not a de Polignac number, because 55042237 - 2¹¹ = 55040189 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 (55046237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30358 + ... + 32119.

It is an arithmetic number, because the mean of its divisors is an integer number (13776399).

Almost surely, 2^55042237 is an apocalyptic number.

It is an amenable number.

55042237 is a deficient number, since it is larger than the sum of its proper divisors (63359).

55042237 is an equidigital number, since it uses as much as digits as its factorization.

55042237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63358.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 55042237 is about 7419.0455585608. The cubic root of 55042237 is about 380.3925698358.

The spelling of 55042237 in words is "fifty-five million, forty-two thousand, two hundred thirty-seven".