551778317 has 2 divisors, whose sum is σ = 551778318. Its totient is φ = 551778316.

The previous prime is 551778307. The next prime is 551778329. The reversal of 551778317 is 713877155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504182116 + 47596201 = 22454^2 + 6899^2 .

It is a cyclic number.

It is not a de Polignac number, because 551778317 - 2⁴ = 551778301 is a prime.

It is a super-2 number, since 2×551778317² = 608918622222704978, which contains 22 as substring.

It is a Chen prime.

It is equal to p_28933883 and since 551778317 and 28933883 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551778307) 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, 275889158 + 275889159.

It is an arithmetic number, because the mean of its divisors is an integer number (275889159).

Almost surely, 2^551778317 is an apocalyptic number.

It is an amenable number.

551778317 is a deficient number, since it is larger than the sum of its proper divisors (1).

551778317 is an equidigital number, since it uses as much as digits as its factorization.

551778317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 205800, while the sum is 44.

The square root of 551778317 is about 23489.9620476492. The cubic root of 551778317 is about 820.2033587442.

The spelling of 551778317 in words is "five hundred fifty-one million, seven hundred seventy-eight thousand, three hundred seventeen".