47791221 has 8 divisors (see below), whose sum is σ = 64378944. Its totient is φ = 31532160.

The previous prime is 47791207. The next prime is 47791253. The reversal of 47791221 is 12219774.

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

It is not a de Polignac number, because 47791221 - 2⁹ = 47790709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47791721) 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, 81825 + ... + 82406.

It is an arithmetic number, because the mean of its divisors is an integer number (8047368).

Almost surely, 2^47791221 is an apocalyptic number.

It is an amenable number.

47791221 is a deficient number, since it is larger than the sum of its proper divisors (16587723).

47791221 is a wasteful number, since it uses less digits than its factorization.

47791221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164331.

The product of its digits is 7056, while the sum is 33.

The square root of 47791221 is about 6913.1194839956. The cubic root of 47791221 is about 362.8964407970.

The spelling of 47791221 in words is "forty-seven million, seven hundred ninety-one thousand, two hundred twenty-one".