551512813 has 2 divisors, whose sum is σ = 551512814. Its totient is φ = 551512812.

The previous prime is 551512777. The next prime is 551512873. The reversal of 551512813 is 318215155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 545549449 + 5963364 = 23357^2 + 2442^2 .

It is a cyclic number.

It is not a de Polignac number, because 551512813 - 2⁹ = 551512301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551512873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275756406 + 275756407.

It is an arithmetic number, because the mean of its divisors is an integer number (275756407).

Almost surely, 2^551512813 is an apocalyptic number.

It is an amenable number.

551512813 is a deficient number, since it is larger than the sum of its proper divisors (1).

551512813 is an equidigital number, since it uses as much as digits as its factorization.

551512813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6000, while the sum is 31.

The square root of 551512813 is about 23484.3099323783. The cubic root of 551512813 is about 820.0717828296.

Adding to 551512813 its reverse (318215155), we get a palindrome (869727968).

The spelling of 551512813 in words is "five hundred fifty-one million, five hundred twelve thousand, eight hundred thirteen".