649167869 has 16 divisors (see below), whose sum is σ = 774466560. Its totient is φ = 532414080.

The previous prime is 649167859. The next prime is 649167877. The reversal of 649167869 is 968761946.

It is a cyclic number.

It is not a de Polignac number, because 649167869 - 2¹² = 649163773 is a prime.

It is a super-2 number, since 2×649167869² = 842837844284002322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649167809) 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 15 ways as a sum of consecutive naturals, for example, 2507 + ... + 36119.

It is an arithmetic number, because the mean of its divisors is an integer number (48404160).

Almost surely, 2^649167869 is an apocalyptic number.

It is an amenable number.

649167869 is a deficient number, since it is larger than the sum of its proper divisors (125298691).

649167869 is a wasteful number, since it uses less digits than its factorization.

649167869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33740.

The product of its digits is 3919104, while the sum is 56.

The square root of 649167869 is about 25478.7729100128. The cubic root of 649167869 is about 865.8692939398.

The spelling of 649167869 in words is "six hundred forty-nine million, one hundred sixty-seven thousand, eight hundred sixty-nine".