649331 has 4 divisors (see below), whose sum is σ = 651000. Its totient is φ = 647664.

The previous prime is 649321. The next prime is 649361. The reversal of 649331 is 133946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133946 = 2 ⋅66973.

It is a cyclic number.

It is not a de Polignac number, because 649331 - 2¹⁸ = 387187 is a prime.

It is a super-3 number, since 3×649331³ = 821333744833595073, which contains 333 as substring. Note that it is a super-d number also for d = 2.

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 649331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95 + ... + 1143.

It is an arithmetic number, because the mean of its divisors is an integer number (162750).

2⁶⁴⁹³³¹ is an apocalyptic number.

649331 is a deficient number, since it is larger than the sum of its proper divisors (1669).

649331 is a wasteful number, since it uses less digits than its factorization.

649331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668.

The product of its digits is 1944, while the sum is 26.

The square root of 649331 is about 805.8107718317. The cubic root of 649331 is about 86.5941816678.

The spelling of 649331 in words is "six hundred forty-nine thousand, three hundred thirty-one".