649291105 has 4 divisors (see below), whose sum is σ = 779149332. Its totient is φ = 519432880.

The previous prime is 649291043. The next prime is 649291109. The reversal of 649291105 is 501192946.

649291105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 175271121 + 474019984 = 13239^2 + 21772^2 .

It is not a de Polignac number, because 649291105 - 2⁷ = 649290977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649291109) 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, 64929106 + ... + 64929115.

It is an arithmetic number, because the mean of its divisors is an integer number (194787333).

Almost surely, 2^649291105 is an apocalyptic number.

It is an amenable number.

649291105 is a deficient number, since it is larger than the sum of its proper divisors (129858227).

649291105 is a wasteful number, since it uses less digits than its factorization.

649291105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129858226.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 649291105 is about 25481.1912005699. The cubic root of 649291105 is about 865.9240817802.

The spelling of 649291105 in words is "six hundred forty-nine million, two hundred ninety-one thousand, one hundred five".