51375281 has 2 divisors, whose sum is σ = 51375282. Its totient is φ = 51375280.

The previous prime is 51375271. The next prime is 51375287. The reversal of 51375281 is 18257315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42042256 + 9333025 = 6484^2 + 3055^2 .

It is a cyclic number.

It is not a de Polignac number, because 51375281 - 2⁶ = 51375217 is a prime.

It is a super-2 number, since 2×51375281² = 5278838995657922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51375287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25687640 + 25687641.

It is an arithmetic number, because the mean of its divisors is an integer number (25687641).

Almost surely, 2^51375281 is an apocalyptic number.

It is an amenable number.

51375281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51375281 is an equidigital number, since it uses as much as digits as its factorization.

51375281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 32.

The square root of 51375281 is about 7167.6551953899. The cubic root of 51375281 is about 371.7503648519.

The spelling of 51375281 in words is "fifty-one million, three hundred seventy-five thousand, two hundred eighty-one".