51587281 has 2 divisors, whose sum is σ = 51587282. Its totient is φ = 51587280.

The previous prime is 51587269. The next prime is 51587293. The reversal of 51587281 is 18278515.

It is a balanced prime because it is at equal distance from previous prime (51587269) and next prime (51587293).

It can be written as a sum of positive squares in only one way, i.e., 50183056 + 1404225 = 7084^2 + 1185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51587281 is a prime.

It is a super-2 number, since 2×51587281² = 5322495121945922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51587281.

It is not a weakly prime, because it can be changed into another prime (51587581) 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, 25793640 + 25793641.

It is an arithmetic number, because the mean of its divisors is an integer number (25793641).

Almost surely, 2^51587281 is an apocalyptic number.

It is an amenable number.

51587281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51587281 is an equidigital number, since it uses as much as digits as its factorization.

51587281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 37.

The square root of 51587281 is about 7182.4286282566. The cubic root of 51587281 is about 372.2610055015.

The spelling of 51587281 in words is "fifty-one million, five hundred eighty-seven thousand, two hundred eighty-one".