551665117 has 2 divisors, whose sum is σ = 551665118. Its totient is φ = 551665116.

The previous prime is 551665099. The next prime is 551665139. The reversal of 551665117 is 711566155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394062201 + 157602916 = 19851^2 + 12554^2 .

It is a cyclic number.

It is not a de Polignac number, because 551665117 - 2⁷ = 551664989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551665417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275832558 + 275832559.

It is an arithmetic number, because the mean of its divisors is an integer number (275832559).

Almost surely, 2^551665117 is an apocalyptic number.

It is an amenable number.

551665117 is a deficient number, since it is larger than the sum of its proper divisors (1).

551665117 is an equidigital number, since it uses as much as digits as its factorization.

551665117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31500, while the sum is 37.

The square root of 551665117 is about 23487.5523841885. The cubic root of 551665117 is about 820.1472653414.

The spelling of 551665117 in words is "five hundred fifty-one million, six hundred sixty-five thousand, one hundred seventeen".