1649985539 has 8 divisors (see below), whose sum is σ = 1658313072. Its totient is φ = 1641669120.

The previous prime is 1649985529. The next prime is 1649985581. The reversal of 1649985539 is 9355899461.

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 1649985539 - 2⁸ = 1649985283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649985529) 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, 602804 + ... + 605534.

It is an arithmetic number, because the mean of its divisors is an integer number (207289134).

Almost surely, 2^1649985539 is an apocalyptic number.

1649985539 is a deficient number, since it is larger than the sum of its proper divisors (8327533).

1649985539 is a wasteful number, since it uses less digits than its factorization.

1649985539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5557.

The product of its digits is 10497600, while the sum is 59.

The square root of 1649985539 is about 40620.0140201847. The cubic root of 1649985539 is about 1181.6622983224.

The spelling of 1649985539 in words is "one billion, six hundred forty-nine million, nine hundred eighty-five thousand, five hundred thirty-nine".