649272185 has 8 divisors (see below), whose sum is σ = 780393096. Its totient is φ = 518573440.

The previous prime is 649272163. The next prime is 649272191. The reversal of 649272185 is 581272946.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11002489 + 638269696 = 3317^2 + 25264^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649272185 - 2¹² = 649268089 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 102146 + ... + 108315.

It is an arithmetic number, because the mean of its divisors is an integer number (97549137).

Almost surely, 2^649272185 is an apocalyptic number.

It is an amenable number.

649272185 is a deficient number, since it is larger than the sum of its proper divisors (131120911).

649272185 is a wasteful number, since it uses less digits than its factorization.

649272185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211083.

The product of its digits is 241920, while the sum is 44.

The square root of 649272185 is about 25480.8199436360. The cubic root of 649272185 is about 865.9156708417.

The spelling of 649272185 in words is "six hundred forty-nine million, two hundred seventy-two thousand, one hundred eighty-five".