649441 has 4 divisors (see below), whose sum is σ = 699412. Its totient is φ = 599472.

The previous prime is 649427. The next prime is 649457. The reversal of 649441 is 144946.

649441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 129600 + 519841 = 360^2 + 721^2 .

It is a cyclic number.

It is not a de Polignac number, because 649441 - 2¹⁵ = 616673 is a prime.

It is a super-2 number, since 2×649441² = 843547224962, which contains 22 as substring.

It is a Duffinian number.

649441 is a lucky number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (649421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24966 + ... + 24991.

It is an arithmetic number, because the mean of its divisors is an integer number (174853).

2⁶⁴⁹⁴⁴¹ is an apocalyptic number.

It is an amenable number.

649441 is a deficient number, since it is larger than the sum of its proper divisors (49971).

649441 is a wasteful number, since it uses less digits than its factorization.

649441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49970.

The product of its digits is 3456, while the sum is 28.

The square root of 649441 is about 805.8790231790. The cubic root of 649441 is about 86.5990712244.

The spelling of 649441 in words is "six hundred forty-nine thousand, four hundred forty-one".