649513 has 4 divisors (see below), whose sum is σ = 671940. Its totient is φ = 627088.

The previous prime is 649511. The next prime is 649529. The reversal of 649513 is 315946.

649513 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 514089 + 135424 = 717^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 649513 - 2¹ = 649511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649511) 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, 11170 + ... + 11227.

It is an arithmetic number, because the mean of its divisors is an integer number (167985).

2⁶⁴⁹⁵¹³ is an apocalyptic number.

It is an amenable number.

649513 is a deficient number, since it is larger than the sum of its proper divisors (22427).

649513 is a wasteful number, since it uses less digits than its factorization.

649513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22426.

The product of its digits is 3240, while the sum is 28.

The square root of 649513 is about 805.9236936584. The cubic root of 649513 is about 86.6022713626.

The spelling of 649513 in words is "six hundred forty-nine thousand, five hundred thirteen".