649711 has 4 divisors (see below), whose sum is σ = 660424. Its totient is φ = 639000.

The previous prime is 649709. The next prime is 649717. The reversal of 649711 is 117946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 649711 - 2¹ = 649709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649717) 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, 5265 + ... + 5386.

It is an arithmetic number, because the mean of its divisors is an integer number (165106).

2⁶⁴⁹⁷¹¹ is an apocalyptic number.

649711 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

649711 is a deficient number, since it is larger than the sum of its proper divisors (10713).

649711 is a wasteful number, since it uses less digits than its factorization.

649711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10712.

The product of its digits is 1512, while the sum is 28.

The square root of 649711 is about 806.0465247118. The cubic root of 649711 is about 86.6110705232.

The spelling of 649711 in words is "six hundred forty-nine thousand, seven hundred eleven".