649240563 has 18 divisors (see below), whose sum is σ = 887298924. Its totient is φ = 422264544.

The previous prime is 649240549. The next prime is 649240567. The reversal of 649240563 is 365042946.

It is not a de Polignac number, because 649240563 - 2²¹ = 647143411 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (649240567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2074095 + ... + 2074407.

Almost surely, 2^649240563 is an apocalyptic number.

649240563 is a deficient number, since it is larger than the sum of its proper divisors (238058361).

649240563 is an frugal number, since it uses more digits than its factorization.

649240563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 649240563 is about 25480.1994301458. The cubic root of 649240563 is about 865.9016128289.

The spelling of 649240563 in words is "six hundred forty-nine million, two hundred forty thousand, five hundred sixty-three".