51428147 has 2 divisors, whose sum is σ = 51428148. Its totient is φ = 51428146.

The previous prime is 51428141. The next prime is 51428149. The reversal of 51428147 is 74182415.

It is a happy number.

51428147 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-51428147 is a prime.

Together with 51428149, 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 (51428141) 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, 25714073 + 25714074.

It is an arithmetic number, because the mean of its divisors is an integer number (25714074).

Almost surely, 2^51428147 is an apocalyptic number.

51428147 is a deficient number, since it is larger than the sum of its proper divisors (1).

51428147 is an equidigital number, since it uses as much as digits as its factorization.

51428147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 51428147 is about 7171.3420640770. The cubic root of 51428147 is about 371.8778335307.

The spelling of 51428147 in words is "fifty-one million, four hundred twenty-eight thousand, one hundred forty-seven".