51261751 has 2 divisors, whose sum is σ = 51261752. Its totient is φ = 51261750.

The previous prime is 51261739. The next prime is 51261773. The reversal of 51261751 is 15716215.

51261751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51261751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51261731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25630875 + 25630876.

It is an arithmetic number, because the mean of its divisors is an integer number (25630876).

Almost surely, 2^51261751 is an apocalyptic number.

51261751 is a deficient number, since it is larger than the sum of its proper divisors (1).

51261751 is an equidigital number, since it uses as much as digits as its factorization.

51261751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 28.

The square root of 51261751 is about 7159.7312100385. The cubic root of 51261751 is about 371.4763293972.

Adding to 51261751 its reverse (15716215), we get a palindrome (66977966).

The spelling of 51261751 in words is "fifty-one million, two hundred sixty-one thousand, seven hundred fifty-one".