54647891 has 2 divisors, whose sum is σ = 54647892. Its totient is φ = 54647890.

The previous prime is 54647881. The next prime is 54647893. The reversal of 54647891 is 19874645.

54647891 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 a de Polignac number, because none of the positive numbers 2^k-54647891 is a prime.

It is a Sophie Germain prime.

Together with 54647893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (54647893) 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, 27323945 + 27323946.

It is an arithmetic number, because the mean of its divisors is an integer number (27323946).

Almost surely, 2^54647891 is an apocalyptic number.

54647891 is a deficient number, since it is larger than the sum of its proper divisors (1).

54647891 is an equidigital number, since it uses as much as digits as its factorization.

54647891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 54647891 is about 7392.4211865937. The cubic root of 54647891 is about 379.4819603019.

The spelling of 54647891 in words is "fifty-four million, six hundred forty-seven thousand, eight hundred ninety-one".