51028709 has 2 divisors, whose sum is σ = 51028710. Its totient is φ = 51028708.

The previous prime is 51028639. The next prime is 51028711. The reversal of 51028709 is 90782015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35402500 + 15626209 = 5950^2 + 3953^2 .

It is a cyclic number.

It is not a de Polignac number, because 51028709 - 2¹² = 51024613 is a prime.

Together with 51028711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51028739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25514354 + 25514355.

It is an arithmetic number, because the mean of its divisors is an integer number (25514355).

Almost surely, 2^51028709 is an apocalyptic number.

It is an amenable number.

51028709 is a deficient number, since it is larger than the sum of its proper divisors (1).

51028709 is an equidigital number, since it uses as much as digits as its factorization.

51028709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 51028709 is about 7143.4381777965. The cubic root of 51028709 is about 370.9125490438.

The spelling of 51028709 in words is "fifty-one million, twenty-eight thousand, seven hundred nine".