649389913 has 8 divisors (see below), whose sum is σ = 667088928. Its totient is φ = 631809024.

The previous prime is 649389911. The next prime is 649389943. The reversal of 649389913 is 319983946.

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

It is a cyclic number.

It is not a de Polignac number, because 649389913 - 2¹ = 649389911 is a prime.

It is a super-2 number, since 2×649389913² = 843414518212295138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649389911) 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, 18331 + ... + 40432.

It is an arithmetic number, because the mean of its divisors is an integer number (83386116).

Almost surely, 2^649389913 is an apocalyptic number.

It is an amenable number.

649389913 is a deficient number, since it is larger than the sum of its proper divisors (17699015).

649389913 is a wasteful number, since it uses less digits than its factorization.

649389913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59063.

The product of its digits is 1259712, while the sum is 52.

The square root of 649389913 is about 25483.1299686675. The cubic root of 649389913 is about 865.9680044965.

The spelling of 649389913 in words is "six hundred forty-nine million, three hundred eighty-nine thousand, nine hundred thirteen".