55281247 has 4 divisors (see below), whose sum is σ = 63178576. Its totient is φ = 47383920.

The previous prime is 55281227. The next prime is 55281253. The reversal of 55281247 is 74218255.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74218255 = 5 ⋅14843651.

It is a cyclic number.

It is not a de Polignac number, because 55281247 - 2²³ = 46892639 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 (55281227) 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, 3948654 + ... + 3948667.

It is an arithmetic number, because the mean of its divisors is an integer number (15794644).

Almost surely, 2^55281247 is an apocalyptic number.

55281247 is a deficient number, since it is larger than the sum of its proper divisors (7897329).

55281247 is an equidigital number, since it uses as much as digits as its factorization.

55281247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7897328.

The product of its digits is 22400, while the sum is 34.

The square root of 55281247 is about 7435.1359772367. The cubic root of 55281247 is about 380.9423679082.

The spelling of 55281247 in words is "fifty-five million, two hundred eighty-one thousand, two hundred forty-seven".