649941 has 4 divisors (see below), whose sum is σ = 866592. Its totient is φ = 433292.

The previous prime is 649937. The next prime is 649969. The reversal of 649941 is 149946.

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 649941 - 2² = 649937 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649941.

It is not an unprimeable number, because it can be changed into a prime (649921) 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, 108321 + ... + 108326.

It is an arithmetic number, because the mean of its divisors is an integer number (216648).

2⁶⁴⁹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

649941 is a deficient number, since it is larger than the sum of its proper divisors (216651).

649941 is a wasteful number, since it uses less digits than its factorization.

649941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216650.

The product of its digits is 7776, while the sum is 33.

The square root of 649941 is about 806.1891837528. The cubic root of 649941 is about 86.6212895262.

The spelling of 649941 in words is "six hundred forty-nine thousand, nine hundred forty-one".