649809169 has 8 divisors (see below), whose sum is σ = 664207488. Its totient is φ = 635434800.

The previous prime is 649809151. The next prime is 649809187. The reversal of 649809169 is 961908946.

649809169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (649809151) and next prime (649809187).

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 649809169 - 2⁵ = 649809137 is a prime.

It is a super-2 number, since 2×649809169² = 844503912232941122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649800169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55834 + ... + 66460.

It is an arithmetic number, because the mean of its divisors is an integer number (83025936).

Almost surely, 2^649809169 is an apocalyptic number.

It is an amenable number.

649809169 is a deficient number, since it is larger than the sum of its proper divisors (14398319).

649809169 is a wasteful number, since it uses less digits than its factorization.

649809169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11975.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 649809169 is about 25491.3547894183. The cubic root of 649809169 is about 866.1543251078.

The spelling of 649809169 in words is "six hundred forty-nine million, eight hundred nine thousand, one hundred sixty-nine".