551226521 has 2 divisors, whose sum is σ = 551226522. Its totient is φ = 551226520.

The previous prime is 551226517. The next prime is 551226541. The reversal of 551226521 is 125622155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549433600 + 1792921 = 23440^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 551226521 - 2² = 551226517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (551226541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275613260 + 275613261.

It is an arithmetic number, because the mean of its divisors is an integer number (275613261).

Almost surely, 2^551226521 is an apocalyptic number.

It is an amenable number.

551226521 is a deficient number, since it is larger than the sum of its proper divisors (1).

551226521 is an equidigital number, since it uses as much as digits as its factorization.

551226521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6000, while the sum is 29.

The square root of 551226521 is about 23478.2137523279. The cubic root of 551226521 is about 819.9298576727.

Adding to 551226521 its reverse (125622155), we get a palindrome (676848676).

The spelling of 551226521 in words is "five hundred fifty-one million, two hundred twenty-six thousand, five hundred twenty-one".