649601 has 4 divisors (see below), whose sum is σ = 664752. Its totient is φ = 634452.

The previous prime is 649577. The next prime is 649613. The reversal of 649601 is 106946.

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 a de Polignac number, because none of the positive numbers 2^k-649601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (649631) 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, 7511 + ... + 7596.

It is an arithmetic number, because the mean of its divisors is an integer number (166188).

2⁶⁴⁹⁶⁰¹ is an apocalyptic number.

It is an amenable number.

649601 is a deficient number, since it is larger than the sum of its proper divisors (15151).

649601 is a wasteful number, since it uses less digits than its factorization.

649601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15150.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 649601 is about 805.9782875487. The cubic root of 649601 is about 86.6061823214.

It can be divided in two parts, 6 and 49601, that multiplied together give a triangular number (297606 = T₇₇₁).

The spelling of 649601 in words is "six hundred forty-nine thousand, six hundred one".