47642171 has 4 divisors (see below), whose sum is σ = 47770272. Its totient is φ = 47514072.

The previous prime is 47642149. The next prime is 47642173. The reversal of 47642171 is 17124674.

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 47642171 - 2⁶ = 47642107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47642173) 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, 63491 + ... + 64236.

It is an arithmetic number, because the mean of its divisors is an integer number (11942568).

Almost surely, 2^47642171 is an apocalyptic number.

47642171 is a deficient number, since it is larger than the sum of its proper divisors (128101).

47642171 is a wasteful number, since it uses less digits than its factorization.

47642171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128100.

The product of its digits is 9408, while the sum is 32.

The square root of 47642171 is about 6902.3308382024. The cubic root of 47642171 is about 362.5187839652.

The spelling of 47642171 in words is "forty-seven million, six hundred forty-two thousand, one hundred seventy-one".