551504521 has 2 divisors, whose sum is σ = 551504522. Its totient is φ = 551504520.

The previous prime is 551504501. The next prime is 551504543. The reversal of 551504521 is 125405155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 295152400 + 256352121 = 17180^2 + 16011^2 .

It is a cyclic number.

It is not a de Polignac number, because 551504521 - 2¹³ = 551496329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551504521.

It is not a weakly prime, because it can be changed into another prime (551504501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275752260 + 275752261.

It is an arithmetic number, because the mean of its divisors is an integer number (275752261).

Almost surely, 2^551504521 is an apocalyptic number.

It is an amenable number.

551504521 is a deficient number, since it is larger than the sum of its proper divisors (1).

551504521 is an equidigital number, since it uses as much as digits as its factorization.

551504521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 551504521 is about 23484.1333883114. The cubic root of 551504521 is about 820.0676728801.

Adding to 551504521 its reverse (125405155), we get a palindrome (676909676).

The spelling of 551504521 in words is "five hundred fifty-one million, five hundred four thousand, five hundred twenty-one".