47721165 has 8 divisors (see below), whose sum is σ = 76353888. Its totient is φ = 25451280.

The previous prime is 47721161. The next prime is 47721173. The reversal of 47721165 is 56112774.

47721165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 47721165 - 2² = 47721161 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47721161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1590691 + ... + 1590720.

It is an arithmetic number, because the mean of its divisors is an integer number (9544236).

Almost surely, 2^47721165 is an apocalyptic number.

It is an amenable number.

47721165 is a deficient number, since it is larger than the sum of its proper divisors (28632723).

47721165 is a wasteful number, since it uses less digits than its factorization.

47721165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3181419.

The product of its digits is 11760, while the sum is 33.

The square root of 47721165 is about 6908.0507380881. The cubic root of 47721165 is about 362.7190336986.

The spelling of 47721165 in words is "forty-seven million, seven hundred twenty-one thousand, one hundred sixty-five".