51251287 has 2 divisors, whose sum is σ = 51251288. Its totient is φ = 51251286.

The previous prime is 51251269. The next prime is 51251359. The reversal of 51251287 is 78215215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51251287 - 2¹¹ = 51249239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51251687) 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, 25625643 + 25625644.

It is an arithmetic number, because the mean of its divisors is an integer number (25625644).

Almost surely, 2^51251287 is an apocalyptic number.

51251287 is a deficient number, since it is larger than the sum of its proper divisors (1).

51251287 is an equidigital number, since it uses as much as digits as its factorization.

51251287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600, while the sum is 31.

The square root of 51251287 is about 7159.0004190529. Note that the first 3 decimals coincide. The cubic root of 51251287 is about 371.4510513374.

It can be divided in two parts, 512512 and 87, that multiplied together give a palindrome (44588544).

The spelling of 51251287 in words is "fifty-one million, two hundred fifty-one thousand, two hundred eighty-seven".