1649412809 has 8 divisors (see below), whose sum is σ = 1801560960. Its totient is φ = 1497631600.

The previous prime is 1649412803. The next prime is 1649412827. The reversal of 1649412809 is 9082149461.

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 1649412809 - 2²⁰ = 1648364233 is a prime.

It is a super-2 number, since 2×1649412809² = 5441125228986540962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1649412809.

It is not an unprimeable number, because it can be changed into a prime (1649412803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82289 + ... + 100350.

It is an arithmetic number, because the mean of its divisors is an integer number (225195120).

Almost surely, 2^1649412809 is an apocalyptic number.

It is an amenable number.

1649412809 is a deficient number, since it is larger than the sum of its proper divisors (152148151).

1649412809 is a wasteful number, since it uses less digits than its factorization.

1649412809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183471.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 1649412809 is about 40612.9635584502. The cubic root of 1649412809 is about 1181.5255593929.

The spelling of 1649412809 in words is "one billion, six hundred forty-nine million, four hundred twelve thousand, eight hundred nine".