550655621 has 2 divisors, whose sum is σ = 550655622. Its totient is φ = 550655620.

The previous prime is 550655603. The next prime is 550655629. The reversal of 550655621 is 126556055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380640100 + 170015521 = 19510^2 + 13039^2 .

It is a cyclic number.

It is not a de Polignac number, because 550655621 - 2⁶ = 550655557 is a prime.

It is a super-2 number, since 2×550655621² = 606443225877791282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550655629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275327810 + 275327811.

It is an arithmetic number, because the mean of its divisors is an integer number (275327811).

Almost surely, 2^550655621 is an apocalyptic number.

It is an amenable number.

550655621 is a deficient number, since it is larger than the sum of its proper divisors (1).

550655621 is an equidigital number, since it uses as much as digits as its factorization.

550655621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 550655621 is about 23466.0525227402. The cubic root of 550655621 is about 819.6466954079.

The spelling of 550655621 in words is "five hundred fifty million, six hundred fifty-five thousand, six hundred twenty-one".