1649091065 has 8 divisors (see below), whose sum is σ = 2024930688. Its totient is φ = 1288591920.

The previous prime is 1649091047. The next prime is 1649091071. The reversal of 1649091065 is 5601909461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1649091065 - 2²⁴ = 1632313849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3834881 + ... + 3835310.

It is an arithmetic number, because the mean of its divisors is an integer number (253116336).

Almost surely, 2^1649091065 is an apocalyptic number.

It is an amenable number.

1649091065 is a deficient number, since it is larger than the sum of its proper divisors (375839623).

1649091065 is an equidigital number, since it uses as much as digits as its factorization.

1649091065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7670239.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 1649091065 is about 40609.0022655076. The cubic root of 1649091065 is about 1181.4487293279.

The spelling of 1649091065 in words is "one billion, six hundred forty-nine million, ninety-one thousand, sixty-five".