51158281 has 2 divisors, whose sum is σ = 51158282. Its totient is φ = 51158280.

The previous prime is 51158257. The next prime is 51158329. The reversal of 51158281 is 18285115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37319881 + 13838400 = 6109^2 + 3720^2 .

It is a cyclic number.

It is not a de Polignac number, because 51158281 - 2⁵ = 51158249 is a prime.

It is a super-2 number, since 2×51158281² = 5234339429749922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51158881) 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, 25579140 + 25579141.

It is an arithmetic number, because the mean of its divisors is an integer number (25579141).

Almost surely, 2^51158281 is an apocalyptic number.

It is an amenable number.

51158281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51158281 is an equidigital number, since it uses as much as digits as its factorization.

51158281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3200, while the sum is 31.

The square root of 51158281 is about 7152.5017301641. The cubic root of 51158281 is about 371.2262238436.

The spelling of 51158281 in words is "fifty-one million, one hundred fifty-eight thousand, two hundred eighty-one".