551225509 has 2 divisors, whose sum is σ = 551225510. Its totient is φ = 551225508.

The previous prime is 551225501. The next prime is 551225513. The reversal of 551225509 is 905522155.

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., 551216484 + 9025 = 23478^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 551225509 - 2³ = 551225501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551225501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275612754 + 275612755.

It is an arithmetic number, because the mean of its divisors is an integer number (275612755).

Almost surely, 2^551225509 is an apocalyptic number.

It is an amenable number.

551225509 is a deficient number, since it is larger than the sum of its proper divisors (1).

551225509 is an equidigital number, since it uses as much as digits as its factorization.

551225509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 551225509 is about 23478.1922004229. The cubic root of 551225509 is about 819.9293559010.

The spelling of 551225509 in words is "five hundred fifty-one million, two hundred twenty-five thousand, five hundred nine".