51028309 has 2 divisors, whose sum is σ = 51028310. Its totient is φ = 51028308.

The previous prime is 51028301. The next prime is 51028361. The reversal of 51028309 is 90382015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34398225 + 16630084 = 5865^2 + 4078^2 .

It is a cyclic number.

It is not a de Polignac number, because 51028309 - 2³ = 51028301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51028301) 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, 25514154 + 25514155.

It is an arithmetic number, because the mean of its divisors is an integer number (25514155).

Almost surely, 2^51028309 is an apocalyptic number.

It is an amenable number.

51028309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51028309 is an equidigital number, since it uses as much as digits as its factorization.

51028309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 51028309 is about 7143.4101800191. The cubic root of 51028309 is about 370.9115798808.

The spelling of 51028309 in words is "fifty-one million, twenty-eight thousand, three hundred nine".