649741 has 4 divisors (see below), whose sum is σ = 651484. Its totient is φ = 648000.

The previous prime is 649739. The next prime is 649751. The reversal of 649741 is 147946.

649741 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, and also an emirpimes, since its reverse is a distinct semiprime: 147946 = 2 ⋅73973.

It can be written as a sum of positive squares in 2 ways, for example, as 81225 + 568516 = 285^2 + 754^2 .

It is a 4-Lehmer number, since φ(649741) divides (649741-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 649741 - 2¹ = 649739 is a prime.

It is a Duffinian number.

649741 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649751) 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, 60 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (162871).

2⁶⁴⁹⁷⁴¹ is an apocalyptic number.

It is an amenable number.

649741 is a deficient number, since it is larger than the sum of its proper divisors (1743).

649741 is a wasteful number, since it uses less digits than its factorization.

649741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742.

The product of its digits is 6048, while the sum is 31.

The square root of 649741 is about 806.0651338447. The cubic root of 649741 is about 86.6124035734.

The spelling of 649741 in words is "six hundred forty-nine thousand, seven hundred forty-one".