47539221 has 4 divisors (see below), whose sum is σ = 63385632. Its totient is φ = 31692812.

The previous prime is 47539211. The next prime is 47539237. The reversal of 47539221 is 12293574.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47539221 - 2¹¹ = 47537173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47539201) 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, 7923201 + ... + 7923206.

It is an arithmetic number, because the mean of its divisors is an integer number (15846408).

Almost surely, 2^47539221 is an apocalyptic number.

It is an amenable number.

47539221 is a deficient number, since it is larger than the sum of its proper divisors (15846411).

47539221 is a wasteful number, since it uses less digits than its factorization.

47539221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15846410.

The product of its digits is 15120, while the sum is 33.

The square root of 47539221 is about 6894.8691793246. The cubic root of 47539221 is about 362.2574732896.

The spelling of 47539221 in words is "forty-seven million, five hundred thirty-nine thousand, two hundred twenty-one".