51447749 has 2 divisors, whose sum is σ = 51447750. Its totient is φ = 51447748.

The previous prime is 51447719. The next prime is 51447787. The reversal of 51447749 is 94774415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45995524 + 5452225 = 6782^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 51447749 - 2⁸ = 51447493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51447709) 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, 25723874 + 25723875.

It is an arithmetic number, because the mean of its divisors is an integer number (25723875).

Almost surely, 2^51447749 is an apocalyptic number.

It is an amenable number.

51447749 is a deficient number, since it is larger than the sum of its proper divisors (1).

51447749 is an equidigital number, since it uses as much as digits as its factorization.

51447749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 41.

The square root of 51447749 is about 7172.7086236651. The cubic root of 51447749 is about 371.9250749978.

The spelling of 51447749 in words is "fifty-one million, four hundred forty-seven thousand, seven hundred forty-nine".