51775709 has 2 divisors, whose sum is σ = 51775710. Its totient is φ = 51775708.

The previous prime is 51775697. The next prime is 51775729. The reversal of 51775709 is 90757715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46922500 + 4853209 = 6850^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 51775709 - 2⁸ = 51775453 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 (51775729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25887854 + 25887855.

It is an arithmetic number, because the mean of its divisors is an integer number (25887855).

Almost surely, 2^51775709 is an apocalyptic number.

It is an amenable number.

51775709 is a deficient number, since it is larger than the sum of its proper divisors (1).

51775709 is an equidigital number, since it uses as much as digits as its factorization.

51775709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77175, while the sum is 41.

The square root of 51775709 is about 7195.5339621184. The cubic root of 51775709 is about 372.7136956802.

The spelling of 51775709 in words is "fifty-one million, seven hundred seventy-five thousand, seven hundred nine".