51386987 has 2 divisors, whose sum is σ = 51386988. Its totient is φ = 51386986.

The previous prime is 51386957. The next prime is 51386999. The reversal of 51386987 is 78968315.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51386987 - 2¹⁰ = 51385963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51386917) 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, 25693493 + 25693494.

It is an arithmetic number, because the mean of its divisors is an integer number (25693494).

Almost surely, 2^51386987 is an apocalyptic number.

51386987 is a deficient number, since it is larger than the sum of its proper divisors (1).

51386987 is an equidigital number, since it uses as much as digits as its factorization.

51386987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 51386987 is about 7168.4717339193. The cubic root of 51386987 is about 371.7785974910.

The spelling of 51386987 in words is "fifty-one million, three hundred eighty-six thousand, nine hundred eighty-seven".