5577821 has 2 divisors, whose sum is σ = 5577822. Its totient is φ = 5577820.

The previous prime is 5577797. The next prime is 5577823. The reversal of 5577821 is 1287755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4452100 + 1125721 = 2110^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 5577821 - 2²² = 1383517 is a prime.

It is a super-2 number, since 2×5577821² = 62224174216082, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 5577823, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5577823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2788910 + 2788911.

It is an arithmetic number, because the mean of its divisors is an integer number (2788911).

Almost surely, 2^5577821 is an apocalyptic number.

It is an amenable number.

5577821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5577821 is an equidigital number, since it uses as much as digits as its factorization.

5577821 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 5577821 is about 2361.7410950398. The cubic root of 5577821 is about 177.3460517979.

The spelling of 5577821 in words is "five million, five hundred seventy-seven thousand, eight hundred twenty-one".