550770821 has 2 divisors, whose sum is σ = 550770822. Its totient is φ = 550770820.

The previous prime is 550770817. The next prime is 550770823. The reversal of 550770821 is 128077055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506880196 + 43890625 = 22514^2 + 6625^2 .

It is a cyclic number.

It is not a de Polignac number, because 550770821 - 2² = 550770817 is a prime.

It is a Sophie Germain prime.

Together with 550770823, 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 (550770823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275385410 + 275385411.

It is an arithmetic number, because the mean of its divisors is an integer number (275385411).

Almost surely, 2^550770821 is an apocalyptic number.

It is an amenable number.

550770821 is a deficient number, since it is larger than the sum of its proper divisors (1).

550770821 is an equidigital number, since it uses as much as digits as its factorization.

550770821 is an evil number, because the sum of its binary digits is even.

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

The square root of 550770821 is about 23468.5070040682. The cubic root of 550770821 is about 819.7038495298.

The spelling of 550770821 in words is "five hundred fifty million, seven hundred seventy thousand, eight hundred twenty-one".