649671171 has 16 divisors (see below), whose sum is σ = 872593920. Its totient is φ = 429943680.

The previous prime is 649671109. The next prime is 649671173. The reversal of 649671171 is 171176946.

It is not a de Polignac number, because 649671171 - 2¹¹ = 649669123 is a prime.

It is a super-2 number, since 2×649671171² = 844145260857022482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649671173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258306 + ... + 260808.

It is an arithmetic number, because the mean of its divisors is an integer number (54537120).

Almost surely, 2^649671171 is an apocalyptic number.

649671171 is a deficient number, since it is larger than the sum of its proper divisors (222922749).

649671171 is a wasteful number, since it uses less digits than its factorization.

649671171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106.

The product of its digits is 63504, while the sum is 42.

The square root of 649671171 is about 25488.6478848918. The cubic root of 649671171 is about 866.0930065790.

The spelling of 649671171 in words is "six hundred forty-nine million, six hundred seventy-one thousand, one hundred seventy-one".