649817 has 4 divisors (see below), whose sum is σ = 742656. Its totient is φ = 556980.

The previous prime is 649813. The next prime is 649829. The reversal of 649817 is 718946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649817 - 2² = 649813 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 649817.

It is not an unprimeable number, because it can be changed into a prime (649813) 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, 46409 + ... + 46422.

It is an arithmetic number, because the mean of its divisors is an integer number (185664).

2⁶⁴⁹⁸¹⁷ is an apocalyptic number.

It is an amenable number.

649817 is a deficient number, since it is larger than the sum of its proper divisors (92839).

649817 is an equidigital number, since it uses as much as digits as its factorization.

649817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92838.

The product of its digits is 12096, while the sum is 35.

The square root of 649817 is about 806.1122750585. The cubic root of 649817 is about 86.6157804502.

The spelling of 649817 in words is "six hundred forty-nine thousand, eight hundred seventeen".