247679221 has 8 divisors (see below), whose sum is σ = 257441184. Its totient is φ = 238078800.

The previous prime is 247679209. The next prime is 247679251. The reversal of 247679221 is 122976742.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 247679221 - 2⁵ = 247679189 is a prime.

It is a super-2 number, since 2×247679221² = 122689993030333682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247679251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37255 + ... + 43396.

It is an arithmetic number, because the mean of its divisors is an integer number (32180148).

Almost surely, 2^247679221 is an apocalyptic number.

It is an amenable number.

247679221 is a deficient number, since it is larger than the sum of its proper divisors (9761963).

247679221 is an equidigital number, since it uses as much as digits as its factorization.

247679221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80771.

The product of its digits is 84672, while the sum is 40.

The square root of 247679221 is about 15737.8277090582. The cubic root of 247679221 is about 628.0051294765.

The spelling of 247679221 in words is "two hundred forty-seven million, six hundred seventy-nine thousand, two hundred twenty-one".