550731521 has 2 divisors, whose sum is σ = 550731522. Its totient is φ = 550731520.

The previous prime is 550731497. The next prime is 550731539. The reversal of 550731521 is 125137055.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 550559296 + 172225 = 23464^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 550731521 - 2⁶ = 550731457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (550731221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275365760 + 275365761.

It is an arithmetic number, because the mean of its divisors is an integer number (275365761).

Almost surely, 2^550731521 is an apocalyptic number.

It is an amenable number.

550731521 is a deficient number, since it is larger than the sum of its proper divisors (1).

550731521 is an equidigital number, since it uses as much as digits as its factorization.

550731521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 550731521 is about 23467.6696968404. The cubic root of 550731521 is about 819.6843525349.

Adding to 550731521 its reverse (125137055), we get a palindrome (675868576).

The spelling of 550731521 in words is "five hundred fifty million, seven hundred thirty-one thousand, five hundred twenty-one".