247288849 has 4 divisors (see below), whose sum is σ = 247449636. Its totient is φ = 247128064.

The previous prime is 247288841. The next prime is 247288913. The reversal of 247288849 is 948882742.

It is a happy number.

247288849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948882742 = 2 ⋅474441371.

It can be written as a sum of positive squares in 2 ways, for example, as 93702400 + 153586449 = 9680^2 + 12393^2 .

It is a cyclic number.

It is not a de Polignac number, because 247288849 - 2³ = 247288841 is a prime.

It is a super-2 number, since 2×247288849² = 122303549679489602, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 247288796 and 247288805.

It is not an unprimeable number, because it can be changed into a prime (247288841) 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, 78064 + ... + 81169.

It is an arithmetic number, because the mean of its divisors is an integer number (61862409).

Almost surely, 2^247288849 is an apocalyptic number.

It is an amenable number.

247288849 is a deficient number, since it is larger than the sum of its proper divisors (160787).

247288849 is a wasteful number, since it uses less digits than its factorization.

247288849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160786.

The product of its digits is 2064384, while the sum is 52.

The square root of 247288849 is about 15725.4204713260. The cubic root of 247288849 is about 627.6750189832.

The spelling of 247288849 in words is "two hundred forty-seven million, two hundred eighty-eight thousand, eight hundred forty-nine".