51187847 has 2 divisors, whose sum is σ = 51187848. Its totient is φ = 51187846.

The previous prime is 51187823. The next prime is 51187861. The reversal of 51187847 is 74878115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51187847 - 2¹⁰ = 51186823 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 (51187247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25593923 + 25593924.

It is an arithmetic number, because the mean of its divisors is an integer number (25593924).

Almost surely, 2^51187847 is an apocalyptic number.

51187847 is a deficient number, since it is larger than the sum of its proper divisors (1).

51187847 is an equidigital number, since it uses as much as digits as its factorization.

51187847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 41.

The square root of 51187847 is about 7154.5682609086. The cubic root of 51187847 is about 371.2977245573.

The spelling of 51187847 in words is "fifty-one million, one hundred eighty-seven thousand, eight hundred forty-seven".