649363643 has 4 divisors (see below), whose sum is σ = 655793088. Its totient is φ = 642934200.

The previous prime is 649363619. The next prime is 649363661. The reversal of 649363643 is 346363946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649363643 is a prime.

It is a super-3 number, since 3×649363643³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649363594 and 649363603.

It is not an unprimeable number, because it can be changed into a prime (649363343) 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, 3214571 + ... + 3214772.

It is an arithmetic number, because the mean of its divisors is an integer number (163948272).

Almost surely, 2^649363643 is an apocalyptic number.

649363643 is a deficient number, since it is larger than the sum of its proper divisors (6429445).

649363643 is a wasteful number, since it uses less digits than its factorization.

649363643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6429444.

The product of its digits is 839808, while the sum is 44.

The square root of 649363643 is about 25482.6145244164. The cubic root of 649363643 is about 865.9563272356.

The spelling of 649363643 in words is "six hundred forty-nine million, three hundred sixty-three thousand, six hundred forty-three".