51755281 has 2 divisors, whose sum is σ = 51755282. Its totient is φ = 51755280.

The previous prime is 51755257. The next prime is 51755287. The reversal of 51755281 is 18255715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36192256 + 15563025 = 6016^2 + 3945^2 .

It is a cyclic number.

It is not a de Polignac number, because 51755281 - 2⁷ = 51755153 is a prime.

It is a super-2 number, since 2×51755281² = 5357218222777922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51755287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25877640 + 25877641.

It is an arithmetic number, because the mean of its divisors is an integer number (25877641).

Almost surely, 2^51755281 is an apocalyptic number.

It is an amenable number.

51755281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51755281 is an equidigital number, since it uses as much as digits as its factorization.

51755281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14000, while the sum is 34.

The square root of 51755281 is about 7194.1143304788. The cubic root of 51755281 is about 372.6646714236.

The spelling of 51755281 in words is "fifty-one million, seven hundred fifty-five thousand, two hundred eighty-one".