649913 has 4 divisors (see below), whose sum is σ = 709008. Its totient is φ = 590820.

The previous prime is 649907. The next prime is 649921. The reversal of 649913 is 319946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649913 - 2⁴ = 649897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 649913.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649913.

It is not an unprimeable number, because it can be changed into a prime (649613) 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, 29531 + ... + 29552.

It is an arithmetic number, because the mean of its divisors is an integer number (177252).

2⁶⁴⁹⁹¹³ is an apocalyptic number.

It is an amenable number.

649913 is a deficient number, since it is larger than the sum of its proper divisors (59095).

649913 is a wasteful number, since it uses less digits than its factorization.

649913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59094.

The product of its digits is 5832, while the sum is 32.

The square root of 649913 is about 806.1718179148. The cubic root of 649913 is about 86.6200456026.

The spelling of 649913 in words is "six hundred forty-nine thousand, nine hundred thirteen".