51809441 has 2 divisors, whose sum is σ = 51809442. Its totient is φ = 51809440.

The previous prime is 51809437. The next prime is 51809449. The reversal of 51809441 is 14490815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29757025 + 22052416 = 5455^2 + 4696^2 .

It is a cyclic number.

It is not a de Polignac number, because 51809441 - 2² = 51809437 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51809398 and 51809407.

It is not a weakly prime, because it can be changed into another prime (51809449) 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, 25904720 + 25904721.

It is an arithmetic number, because the mean of its divisors is an integer number (25904721).

Almost surely, 2^51809441 is an apocalyptic number.

It is an amenable number.

51809441 is a deficient number, since it is larger than the sum of its proper divisors (1).

51809441 is an equidigital number, since it uses as much as digits as its factorization.

51809441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 51809441 is about 7197.8775343847. The cubic root of 51809441 is about 372.7946194010.

The spelling of 51809441 in words is "fifty-one million, eight hundred nine thousand, four hundred forty-one".