1649143009 has 4 divisors (see below), whose sum is σ = 1687495216. Its totient is φ = 1610790804.

The previous prime is 1649142983. The next prime is 1649143039. The reversal of 1649143009 is 9003419461.

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 1649143009 - 2⁵ = 1649142977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649143039) 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, 19176039 + ... + 19176124.

It is an arithmetic number, because the mean of its divisors is an integer number (421873804).

Almost surely, 2^1649143009 is an apocalyptic number.

It is an amenable number.

1649143009 is a deficient number, since it is larger than the sum of its proper divisors (38352207).

1649143009 is an equidigital number, since it uses as much as digits as its factorization.

1649143009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38352206.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 1649143009 is about 40609.6418230942. The cubic root of 1649143009 is about 1181.4611338437.

The spelling of 1649143009 in words is "one billion, six hundred forty-nine million, one hundred forty-three thousand, nine".