551505136909 has 2 divisors, whose sum is σ = 551505136910. Its totient is φ = 551505136908.

The previous prime is 551505136753. The next prime is 551505136921. The reversal of 551505136909 is 909631505155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429667140100 + 121837996809 = 655490^2 + 349053^2 .

It is a cyclic number.

It is not a de Polignac number, because 551505136909 - 2⁹ = 551505136397 is a prime.

It is a super-3 number, since 3×551505136909³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551505136939) 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, 275752568454 + 275752568455.

It is an arithmetic number, because the mean of its divisors is an integer number (275752568455).

Almost surely, 2^551505136909 is an apocalyptic number.

It is an amenable number.

551505136909 is a deficient number, since it is larger than the sum of its proper divisors (1).

551505136909 is an equidigital number, since it uses as much as digits as its factorization.

551505136909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 911250, while the sum is 49.

The spelling of 551505136909 in words is "five hundred fifty-one billion, five hundred five million, one hundred thirty-six thousand, nine hundred nine".