51540451 has 2 divisors, whose sum is σ = 51540452. Its totient is φ = 51540450.

The previous prime is 51540439. The next prime is 51540497. The reversal of 51540451 is 15404515.

It is a happy number.

51540451 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-51540451 is a prime.

It is not a weakly prime, because it can be changed into another prime (51540421) 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, 25770225 + 25770226.

It is an arithmetic number, because the mean of its divisors is an integer number (25770226).

Almost surely, 2^51540451 is an apocalyptic number.

51540451 is a deficient number, since it is larger than the sum of its proper divisors (1).

51540451 is an equidigital number, since it uses as much as digits as its factorization.

51540451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 51540451 is about 7179.1678487134. The cubic root of 51540451 is about 372.1483274646.

Adding to 51540451 its reverse (15404515), we get a palindrome (66944966).

The spelling of 51540451 in words is "fifty-one million, five hundred forty thousand, four hundred fifty-one".