865551849 has 4 divisors (see below), whose sum is σ = 1154069136. Its totient is φ = 577034564.

The previous prime is 865551829. The next prime is 865551857. The reversal of 865551849 is 948155568.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 865551849 - 2¹⁶ = 865486313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865551829) 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 in 3 ways as a sum of consecutive naturals, for example, 144258639 + ... + 144258644.

It is an arithmetic number, because the mean of its divisors is an integer number (288517284).

Almost surely, 2^865551849 is an apocalyptic number.

It is an amenable number.

865551849 is a deficient number, since it is larger than the sum of its proper divisors (288517287).

865551849 is a wasteful number, since it uses less digits than its factorization.

865551849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288517286.

The product of its digits is 1728000, while the sum is 51.

The square root of 865551849 is about 29420.2625583117. The cubic root of 865551849 is about 953.0105231591.

The spelling of 865551849 in words is "eight hundred sixty-five million, five hundred fifty-one thousand, eight hundred forty-nine".