51551449 has 2 divisors, whose sum is σ = 51551450. Its totient is φ = 51551448.

The previous prime is 51551443. The next prime is 51551501. The reversal of 51551449 is 94415515.

It is a happy number.

51551449 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 can be written as a sum of positive squares in only one way, i.e., 49280400 + 2271049 = 7020^2 + 1507^2 .

It is a cyclic number.

It is not a de Polignac number, because 51551449 - 2²¹ = 49454297 is a prime.

It is not a weakly prime, because it can be changed into another prime (51551443) 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, 25775724 + 25775725.

It is an arithmetic number, because the mean of its divisors is an integer number (25775725).

Almost surely, 2^51551449 is an apocalyptic number.

It is an amenable number.

51551449 is a deficient number, since it is larger than the sum of its proper divisors (1).

51551449 is an equidigital number, since it uses as much as digits as its factorization.

51551449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 34.

The square root of 51551449 is about 7179.9337740678. The cubic root of 51551449 is about 372.1747959706.

The spelling of 51551449 in words is "fifty-one million, five hundred fifty-one thousand, four hundred forty-nine".