649547 has 4 divisors (see below), whose sum is σ = 654360. Its totient is φ = 644736.

The previous prime is 649541. The next prime is 649559. The reversal of 649547 is 745946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 745946 = 2 ⋅372973.

It is a cyclic number.

It is not a de Polignac number, because 649547 - 2⁶ = 649483 is a prime.

It is a super-2 number, since 2×649547² = 843822610418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649541) 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, 2198 + ... + 2475.

It is an arithmetic number, because the mean of its divisors is an integer number (163590).

2⁶⁴⁹⁵⁴⁷ is an apocalyptic number.

649547 is a deficient number, since it is larger than the sum of its proper divisors (4813).

649547 is a wasteful number, since it uses less digits than its factorization.

649547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4812.

The product of its digits is 30240, while the sum is 35.

The square root of 649547 is about 805.9447871908. The cubic root of 649547 is about 86.6037824567.

The spelling of 649547 in words is "six hundred forty-nine thousand, five hundred forty-seven".