55247257 has 4 divisors (see below), whose sum is σ = 59497060. Its totient is φ = 50997456.

The previous prime is 55247249. The next prime is 55247261. The reversal of 55247257 is 75274255.

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 21013056 + 34234201 = 4584^2 + 5851^2 .

It is a cyclic number.

It is not a de Polignac number, because 55247257 - 2³ = 55247249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55247287) 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, 2124882 + ... + 2124907.

It is an arithmetic number, because the mean of its divisors is an integer number (14874265).

Almost surely, 2^55247257 is an apocalyptic number.

It is an amenable number.

55247257 is a deficient number, since it is larger than the sum of its proper divisors (4249803).

55247257 is a wasteful number, since it uses less digits than its factorization.

55247257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249802.

The product of its digits is 98000, while the sum is 37.

The square root of 55247257 is about 7432.8498572217. The cubic root of 55247257 is about 380.8642770157.

The spelling of 55247257 in words is "fifty-five million, two hundred forty-seven thousand, two hundred fifty-seven".