51028609 has 2 divisors, whose sum is σ = 51028610. Its totient is φ = 51028608.

The previous prime is 51028597. The next prime is 51028633. The reversal of 51028609 is 90682015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48233025 + 2795584 = 6945^2 + 1672^2 .

It is a cyclic number.

It is not a de Polignac number, because 51028609 - 2²³ = 42640001 is a prime.

It is not a weakly prime, because it can be changed into another prime (51028639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25514304 + 25514305.

It is an arithmetic number, because the mean of its divisors is an integer number (25514305).

Almost surely, 2^51028609 is an apocalyptic number.

It is an amenable number.

51028609 is a deficient number, since it is larger than the sum of its proper divisors (1).

51028609 is an equidigital number, since it uses as much as digits as its factorization.

51028609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 51028609 is about 7143.4311783624. The cubic root of 51028609 is about 370.9123067535.

The spelling of 51028609 in words is "fifty-one million, twenty-eight thousand, six hundred nine".