1649831649 has 8 divisors (see below), whose sum is σ = 2221132992. Its totient is φ = 1089209040.

The previous prime is 1649831641. The next prime is 1649831669. The reversal of 1649831649 is 9461389461.

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

It is not a de Polignac number, because 1649831649 - 2³ = 1649831641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1649831641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2669322 + ... + 2669939.

It is an arithmetic number, because the mean of its divisors is an integer number (277641624).

Almost surely, 2^1649831649 is an apocalyptic number.

It is an amenable number.

1649831649 is a deficient number, since it is larger than the sum of its proper divisors (571301343).

1649831649 is a wasteful number, since it uses less digits than its factorization.

1649831649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5339367.

The product of its digits is 1119744, while the sum is 51.

The square root of 1649831649 is about 40618.1197127587. The cubic root of 1649831649 is about 1181.6255602903.

The spelling of 1649831649 in words is "one billion, six hundred forty-nine million, eight hundred thirty-one thousand, six hundred forty-nine".