649049 has 4 divisors (see below), whose sum is σ = 671460. Its totient is φ = 626640.

The previous prime is 649039. The next prime is 649063. The reversal of 649049 is 940946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 940946 = 2 ⋅470473.

It can be written as a sum of positive squares in 2 ways, for example, as 366025 + 283024 = 605^2 + 532^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649039) 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, 11162 + ... + 11219.

It is an arithmetic number, because the mean of its divisors is an integer number (167865).

2⁶⁴⁹⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

649049 is a deficient number, since it is larger than the sum of its proper divisors (22411).

649049 is a wasteful number, since it uses less digits than its factorization.

649049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22410.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 649049 is about 805.6357737837. The cubic root of 649049 is about 86.5816440995.

The spelling of 649049 in words is "six hundred forty-nine thousand, forty-nine".