649139 has 4 divisors (see below), whose sum is σ = 650856. Its totient is φ = 647424.

The previous prime is 649123. The next prime is 649141. The reversal of 649139 is 931946.

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 649139 - 2⁴ = 649123 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649139.

It is not an unprimeable number, because it can be changed into a prime (649039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14 + ... + 1139.

It is an arithmetic number, because the mean of its divisors is an integer number (162714).

2⁶⁴⁹¹³⁹ is an apocalyptic number.

649139 is a deficient number, since it is larger than the sum of its proper divisors (1717).

649139 is a wasteful number, since it uses less digits than its factorization.

649139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716.

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

The square root of 649139 is about 805.6916283542. The cubic root of 649139 is about 86.5856458456.

The spelling of 649139 in words is "six hundred forty-nine thousand, one hundred thirty-nine".