5775821 has 2 divisors, whose sum is σ = 5775822. Its totient is φ = 5775820.

The previous prime is 5775799. The next prime is 5775839. The reversal of 5775821 is 1285775.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5428900 + 346921 = 2330^2 + 589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5775821 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₃₉₈₄₅₆ and since 5775821 and 398456 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5775841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2887910 + 2887911.

It is an arithmetic number, because the mean of its divisors is an integer number (2887911).

Almost surely, 2^5775821 is an apocalyptic number.

It is an amenable number.

5775821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5775821 is an equidigital number, since it uses as much as digits as its factorization.

5775821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19600, while the sum is 35.

The square root of 5775821 is about 2403.2937814591. The cubic root of 5775821 is about 179.4201609025.

The spelling of 5775821 in words is "five million, seven hundred seventy-five thousand, eight hundred twenty-one".