2081917647 has 20 divisors (see below), whose sum is σ = 3273713080. Its totient is φ = 1314894384.

The previous prime is 2081917619. The next prime is 2081917661. The reversal of 2081917647 is 7467191802.

It is a happy number.

It is not a de Polignac number, because 2081917647 - 2¹⁵ = 2081884879 is a prime.

It is a super-3 number, since 3×2081917647³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081917697) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 674848 + ... + 677925.

It is an arithmetic number, because the mean of its divisors is an integer number (163685654).

Almost surely, 2^2081917647 is an apocalyptic number.

2081917647 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2081917647 is a deficient number, since it is larger than the sum of its proper divisors (1191795433).

2081917647 is a wasteful number, since it uses less digits than its factorization.

2081917647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352804 (or 1352795 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 2081917647 is about 45628.0357565390. The cubic root of 2081917647 is about 1276.8930274257.

The spelling of 2081917647 in words is "two billion, eighty-one million, nine hundred seventeen thousand, six hundred forty-seven".