47137891 has 2 divisors, whose sum is σ = 47137892. Its totient is φ = 47137890.

The previous prime is 47137877. The next prime is 47137897. The reversal of 47137891 is 19873174.

47137891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47137891 - 2⁵ = 47137859 is a prime.

It is not a weakly prime, because it can be changed into another prime (47137897) 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 as a sum of consecutive naturals, namely, 23568945 + 23568946.

It is an arithmetic number, because the mean of its divisors is an integer number (23568946).

Almost surely, 2^47137891 is an apocalyptic number.

47137891 is a deficient number, since it is larger than the sum of its proper divisors (1).

47137891 is an equidigital number, since it uses as much as digits as its factorization.

47137891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 47137891 is about 6865.7039697325. The cubic root of 47137891 is about 361.2351887064.

The spelling of 47137891 in words is "forty-seven million, one hundred thirty-seven thousand, eight hundred ninety-one".