47719891 has 4 divisors (see below), whose sum is σ = 47740000. Its totient is φ = 47699784.

The previous prime is 47719853. The next prime is 47719897. The reversal of 47719891 is 19891774.

47719891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 47719891 - 2¹⁷ = 47588819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47719897) 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 3 ways as a sum of consecutive naturals, for example, 5931 + ... + 11428.

It is an arithmetic number, because the mean of its divisors is an integer number (11935000).

Almost surely, 2^47719891 is an apocalyptic number.

47719891 is a deficient number, since it is larger than the sum of its proper divisors (20109).

47719891 is a wasteful number, since it uses less digits than its factorization.

47719891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20108.

The product of its digits is 127008, while the sum is 46.

The square root of 47719891 is about 6907.9585262218. The cubic root of 47719891 is about 362.7158058634.

The spelling of 47719891 in words is "forty-seven million, seven hundred nineteen thousand, eight hundred ninety-one".