47971547 has 4 divisors (see below), whose sum is σ = 51661680. Its totient is φ = 44281416.

The previous prime is 47971493. The next prime is 47971549. The reversal of 47971547 is 74517974.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47971547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47971498 and 47971507.

It is not an unprimeable number, because it can be changed into a prime (47971549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1845047 + ... + 1845072.

It is an arithmetic number, because the mean of its divisors is an integer number (12915420).

Almost surely, 2^47971547 is an apocalyptic number.

47971547 is a deficient number, since it is larger than the sum of its proper divisors (3690133).

47971547 is a wasteful number, since it uses less digits than its factorization.

47971547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690132.

The product of its digits is 246960, while the sum is 44.

The square root of 47971547 is about 6926.1495074825. The cubic root of 47971547 is about 363.3522953004.

The spelling of 47971547 in words is "forty-seven million, nine hundred seventy-one thousand, five hundred forty-seven".