47911191 has 4 divisors (see below), whose sum is σ = 63881592. Its totient is φ = 31940792.

The previous prime is 47911187. The next prime is 47911211. The reversal of 47911191 is 19111974.

47911191 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 47911191 - 2² = 47911187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47911121) 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, 7985196 + ... + 7985201.

It is an arithmetic number, because the mean of its divisors is an integer number (15970398).

Almost surely, 2^47911191 is an apocalyptic number.

47911191 is a deficient number, since it is larger than the sum of its proper divisors (15970401).

47911191 is a wasteful number, since it uses less digits than its factorization.

47911191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15970400.

The product of its digits is 2268, while the sum is 33.

The square root of 47911191 is about 6921.7910254500. The cubic root of 47911191 is about 363.1998459402.

The spelling of 47911191 in words is "forty-seven million, nine hundred eleven thousand, one hundred ninety-one".