649199 has 4 divisors (see below), whose sum is σ = 651000. Its totient is φ = 647400.

The previous prime is 649183. The next prime is 649217. The reversal of 649199 is 991946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 991946 = 2 ⋅495973.

It is a cyclic number.

It is not a de Polignac number, because 649199 - 2⁴ = 649183 is a prime.

It is a Duffinian 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 649199.

It is not an unprimeable number, because it can be changed into a prime (649499) 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, 152 + ... + 1149.

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

2⁶⁴⁹¹⁹⁹ is an apocalyptic number.

649199 is a deficient number, since it is larger than the sum of its proper divisors (1801).

649199 is a wasteful number, since it uses less digits than its factorization.

649199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800.

The product of its digits is 17496, while the sum is 38.

The square root of 649199 is about 805.7288625834. The cubic root of 649199 is about 86.5883134708.

It can be divided in two parts, 649 and 199, that added together give a palindrome (848).

The spelling of 649199 in words is "six hundred forty-nine thousand, one hundred ninety-nine".