551405513 has 2 divisors, whose sum is σ = 551405514. Its totient is φ = 551405512.

The previous prime is 551405497. The next prime is 551405531. The reversal of 551405513 is 315504155.

Together with next prime (551405531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 528862009 + 22543504 = 22997^2 + 4748^2 .

It is a cyclic number.

It is not a de Polignac number, because 551405513 - 2⁴ = 551405497 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 (551425513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275702756 + 275702757.

It is an arithmetic number, because the mean of its divisors is an integer number (275702757).

Almost surely, 2^551405513 is an apocalyptic number.

It is an amenable number.

551405513 is a deficient number, since it is larger than the sum of its proper divisors (1).

551405513 is an equidigital number, since it uses as much as digits as its factorization.

551405513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 551405513 is about 23482.0253172506. The cubic root of 551405513 is about 820.0185961478.

Adding to 551405513 its reverse (315504155), we get a palindrome (866909668).

The spelling of 551405513 in words is "five hundred fifty-one million, four hundred five thousand, five hundred thirteen".