3617921681 has 8 divisors (see below), whose sum is σ = 4074140928. Its totient is φ = 3182922000.

The previous prime is 3617921663. The next prime is 3617921711. The reversal of 3617921681 is 1861297163.

3617921681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 3617921681 - 2¹⁴ = 3617905297 is a prime.

It is a super-2 number, since 2×3617921681² = 26178714579699731522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3617921381) 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, 5304530 + ... + 5305211.

It is an arithmetic number, because the mean of its divisors is an integer number (509267616).

Almost surely, 2^3617921681 is an apocalyptic number.

3617921681 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3617921681 is a deficient number, since it is larger than the sum of its proper divisors (456219247).

3617921681 is a wasteful number, since it uses less digits than its factorization.

3617921681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10609783.

The product of its digits is 108864, while the sum is 44.

The square root of 3617921681 is about 60149.1619309862. The cubic root of 3617921681 is about 1535.1579067042.

The spelling of 3617921681 in words is "three billion, six hundred seventeen million, nine hundred twenty-one thousand, six hundred eighty-one".