649223641 has 8 divisors (see below), whose sum is σ = 708430464. Its totient is φ = 590047920.

The previous prime is 649223633. The next prime is 649223713. The reversal of 649223641 is 146322946.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649223641 - 2³ = 649223633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649223641.

It is not an unprimeable number, because it can be changed into a prime (649223611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68211 + ... + 77143.

It is an arithmetic number, because the mean of its divisors is an integer number (88553808).

Almost surely, 2^649223641 is an apocalyptic number.

It is an amenable number.

649223641 is a deficient number, since it is larger than the sum of its proper divisors (59206823).

649223641 is a wasteful number, since it uses less digits than its factorization.

649223641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15551.

The product of its digits is 62208, while the sum is 37.

The square root of 649223641 is about 25479.8673662168. The cubic root of 649223641 is about 865.8940897241.

The spelling of 649223641 in words is "six hundred forty-nine million, two hundred twenty-three thousand, six hundred forty-one".