47971209 has 16 divisors (see below), whose sum is σ = 75144384. Its totient is φ = 26836800.

The previous prime is 47971207. The next prime is 47971211. The reversal of 47971209 is 90217974.

It is an interprime number because it is at equal distance from previous prime (47971207) and next prime (47971211).

It is not a de Polignac number, because 47971209 - 2¹ = 47971207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (47971207) 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 15 ways as a sum of consecutive naturals, for example, 55482 + ... + 56339.

It is an arithmetic number, because the mean of its divisors is an integer number (4696524).

Almost surely, 2^47971209 is an apocalyptic number.

It is an amenable number.

47971209 is a deficient number, since it is larger than the sum of its proper divisors (27173175).

47971209 is a wasteful number, since it uses less digits than its factorization.

47971209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111848.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 47971209 is about 6926.1251071577. The cubic root of 47971209 is about 363.3514419240.

It can be divided in two parts, 4797 and 1209, that added together give a palindrome (6006).

The spelling of 47971209 in words is "forty-seven million, nine hundred seventy-one thousand, two hundred nine".