247871279 has 4 divisors (see below), whose sum is σ = 253145184. Its totient is φ = 242597376.

The previous prime is 247871249. The next prime is 247871287. The reversal of 247871279 is 972178742.

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

It is a cyclic number.

It is not a de Polignac number, because 247871279 - 2¹² = 247867183 is a prime.

It is a super-2 number, since 2×247871279² = 122880341906191682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 5273857 = 247871279 / (2 + 4 + 7 + 8 + 7 + 1 + 2 + 7 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247871209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2636882 + ... + 2636975.

It is an arithmetic number, because the mean of its divisors is an integer number (63286296).

Almost surely, 2^247871279 is an apocalyptic number.

247871279 is a deficient number, since it is larger than the sum of its proper divisors (5273905).

247871279 is an equidigital number, since it uses as much as digits as its factorization.

247871279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5273904.

The product of its digits is 395136, while the sum is 47.

The square root of 247871279 is about 15743.9283217372. The cubic root of 247871279 is about 628.1674122959.

The spelling of 247871279 in words is "two hundred forty-seven million, eight hundred seventy-one thousand, two hundred seventy-nine".