649189 has 4 divisors (see below), whose sum is σ = 658156. Its totient is φ = 640224.

The previous prime is 649183. The next prime is 649217. The reversal of 649189 is 981946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 216225 + 432964 = 465^2 + 658^2 .

It is a cyclic number.

It is not a de Polignac number, because 649189 - 2⁵ = 649157 is a prime.

It is a Duffinian number.

649189 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649183) 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 in 3 ways as a sum of consecutive naturals, for example, 4374 + ... + 4519.

It is an arithmetic number, because the mean of its divisors is an integer number (164539).

2⁶⁴⁹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

649189 is a deficient number, since it is larger than the sum of its proper divisors (8967).

649189 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 13 representation: 649189 = (199648)₁₃.

649189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8966.

The product of its digits is 15552, while the sum is 37.

The square root of 649189 is about 805.7226569981. The cubic root of 649189 is about 86.5878688780.

It can be divided in two parts, 649 and 189, that added together give a palindrome (838).

The spelling of 649189 in words is "six hundred forty-nine thousand, one hundred eighty-nine".