2081993517 has 8 divisors (see below), whose sum is σ = 3084434880. Its totient is φ = 1387995660.

The previous prime is 2081993513. The next prime is 2081993527. The reversal of 2081993517 is 7153991802.

2081993517 is a `hidden beast` number, since 208 + 1 + 99 + 351 + 7 = 666.

It is not a de Polignac number, because 2081993517 - 2² = 2081993513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081993513) 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, 38555409 + ... + 38555462.

It is an arithmetic number, because the mean of its divisors is an integer number (385554360).

Almost surely, 2^2081993517 is an apocalyptic number.

2081993517 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2081993517 is a deficient number, since it is larger than the sum of its proper divisors (1002441363).

2081993517 is an equidigital number, since it uses as much as digits as its factorization.

2081993517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77110880 (or 77110874 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 2081993517 is about 45628.8671457006. The cubic root of 2081993517 is about 1276.9085382373.

The spelling of 2081993517 in words is "two billion, eighty-one million, nine hundred ninety-three thousand, five hundred seventeen".