51152281 has 2 divisors, whose sum is σ = 51152282. Its totient is φ = 51152280.

The previous prime is 51152279. The next prime is 51152287. The reversal of 51152281 is 18225115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39187600 + 11964681 = 6260^2 + 3459^2 .

It is a cyclic number.

It is not a de Polignac number, because 51152281 - 2¹ = 51152279 is a prime.

It is a super-2 number, since 2×51152281² = 5233111703005922, which contains 22 as substring.

Together with 51152279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51152287) 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, 25576140 + 25576141.

It is an arithmetic number, because the mean of its divisors is an integer number (25576141).

Almost surely, 2^51152281 is an apocalyptic number.

It is an amenable number.

51152281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51152281 is an equidigital number, since it uses as much as digits as its factorization.

51152281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 800, while the sum is 25.

The square root of 51152281 is about 7152.0822842023. The cubic root of 51152281 is about 371.2117104264.

Adding to 51152281 its reverse (18225115), we get a palindrome (69377396).

It can be divided in two parts, 5115 and 2281, that added together give a square (7396 = 86²).

The spelling of 51152281 in words is "fifty-one million, one hundred fifty-two thousand, two hundred eighty-one".