51240751 has 2 divisors, whose sum is σ = 51240752. Its totient is φ = 51240750.

The previous prime is 51240731. The next prime is 51240769. The reversal of 51240751 is 15704215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51240751 - 2¹¹ = 51238703 is a prime.

It is a super-2 number, since 2×51240751² = 5251229126088002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51240731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25620375 + 25620376.

It is an arithmetic number, because the mean of its divisors is an integer number (25620376).

Almost surely, 2^51240751 is an apocalyptic number.

51240751 is a deficient number, since it is larger than the sum of its proper divisors (1).

51240751 is an equidigital number, since it uses as much as digits as its factorization.

51240751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 51240751 is about 7158.2645243103. The cubic root of 51240751 is about 371.4255958694.

Adding to 51240751 its reverse (15704215), we get a palindrome (66944966).

The spelling of 51240751 in words is "fifty-one million, two hundred forty thousand, seven hundred fifty-one".