51839147 has 2 divisors, whose sum is σ = 51839148. Its totient is φ = 51839146.

The previous prime is 51839131. The next prime is 51839191. The reversal of 51839147 is 74193815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51839147 - 2⁴ = 51839131 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51839147.

It is not a weakly prime, because it can be changed into another prime (51839107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25919573 + 25919574.

It is an arithmetic number, because the mean of its divisors is an integer number (25919574).

Almost surely, 2^51839147 is an apocalyptic number.

51839147 is a deficient number, since it is larger than the sum of its proper divisors (1).

51839147 is an equidigital number, since it uses as much as digits as its factorization.

51839147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 51839147 is about 7199.9407636452. The cubic root of 51839147 is about 372.8658555880.

The spelling of 51839147 in words is "fifty-one million, eight hundred thirty-nine thousand, one hundred forty-seven".