47191871 has 2 divisors, whose sum is σ = 47191872. Its totient is φ = 47191870.

The previous prime is 47191841. The next prime is 47191913. The reversal of 47191871 is 17819174.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47191871 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47191811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23595935 + 23595936.

It is an arithmetic number, because the mean of its divisors is an integer number (23595936).

Almost surely, 2^47191871 is an apocalyptic number.

47191871 is a deficient number, since it is larger than the sum of its proper divisors (1).

47191871 is an equidigital number, since it uses as much as digits as its factorization.

47191871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 38.

The square root of 47191871 is about 6869.6339786047. The cubic root of 47191871 is about 361.3730257099.

The spelling of 47191871 in words is "forty-seven million, one hundred ninety-one thousand, eight hundred seventy-one".