1649117309 has 4 divisors (see below), whose sum is σ = 1884705504. Its totient is φ = 1413529116.

The previous prime is 1649117291. The next prime is 1649117311. The reversal of 1649117309 is 9037119461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1649117309 - 2⁸ = 1649117053 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649117329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117794087 + ... + 117794100.

It is an arithmetic number, because the mean of its divisors is an integer number (471176376).

Almost surely, 2^1649117309 is an apocalyptic number.

It is an amenable number.

1649117309 is a deficient number, since it is larger than the sum of its proper divisors (235588195).

1649117309 is an equidigital number, since it uses as much as digits as its factorization.

1649117309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235588194.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 1649117309 is about 40609.3253945445. The cubic root of 1649117309 is about 1181.4549965734.

The spelling of 1649117309 in words is "one billion, six hundred forty-nine million, one hundred seventeen thousand, three hundred nine".