2081649521 has 8 divisors (see below), whose sum is σ = 2383429824. Its totient is φ = 1780969680.

The previous prime is 2081649517. The next prime is 2081649529. The reversal of 2081649521 is 1259461802.

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

It is not a de Polignac number, because 2081649521 - 2² = 2081649517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2081649529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271055 + ... + 278628.

It is an arithmetic number, because the mean of its divisors is an integer number (297928728).

Almost surely, 2^2081649521 is an apocalyptic number.

It is an amenable number.

2081649521 is a deficient number, since it is larger than the sum of its proper divisors (301780303).

2081649521 is an equidigital number, since it uses as much as digits as its factorization.

2081649521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550231.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 2081649521 is about 45625.0974903068. The cubic root of 2081649521 is about 1276.8382089079.

The spelling of 2081649521 in words is "two billion, eighty-one million, six hundred forty-nine thousand, five hundred twenty-one".