855545549 has 2 divisors, whose sum is σ = 855545550. Its totient is φ = 855545548.

The previous prime is 855545543. The next prime is 855545573. The reversal of 855545549 is 945545558.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559086025 + 296459524 = 23645^2 + 17218^2 .

It is a cyclic number.

It is not a de Polignac number, because 855545549 - 2⁸ = 855545293 is a prime.

It is a super-2 number, since 2×855545549² = 1463916372827422802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 855545497 and 855545506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855545543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427772774 + 427772775.

It is an arithmetic number, because the mean of its divisors is an integer number (427772775).

Almost surely, 2^855545549 is an apocalyptic number.

It is an amenable number.

855545549 is a deficient number, since it is larger than the sum of its proper divisors (1).

855545549 is an equidigital number, since it uses as much as digits as its factorization.

855545549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600000, while the sum is 50.

The square root of 855545549 is about 29249.7102378810. The cubic root of 855545549 is about 949.3238213256.

Subtracting 855545549 from its reverse (945545558), we obtain a palindrome (90000009).

The spelling of 855545549 in words is "eight hundred fifty-five million, five hundred forty-five thousand, five hundred forty-nine".