51409451 has 2 divisors, whose sum is σ = 51409452. Its totient is φ = 51409450.

The previous prime is 51409441. The next prime is 51409469. The reversal of 51409451 is 15490415.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51409451 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51409441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25704725 + 25704726.

It is an arithmetic number, because the mean of its divisors is an integer number (25704726).

Almost surely, 2^51409451 is an apocalyptic number.

51409451 is a deficient number, since it is larger than the sum of its proper divisors (1).

51409451 is an equidigital number, since it uses as much as digits as its factorization.

51409451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 51409451 is about 7170.0384238859. The cubic root of 51409451 is about 371.8327643674.

Adding to 51409451 its reverse (15490415), we get a palindrome (66899866).

The spelling of 51409451 in words is "fifty-one million, four hundred nine thousand, four hundred fifty-one".