4003688681 has 2 divisors, whose sum is σ = 4003688682. Its totient is φ = 4003688680.

The previous prime is 4003688659. The next prime is 4003688737. The reversal of 4003688681 is 1868863004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2284840000 + 1718848681 = 47800^2 + 41459^2 .

It is a cyclic number.

It is not a de Polignac number, because 4003688681 - 2¹⁴ = 4003672297 is a prime.

It is a super-2 number, since 2×4003688681² = 32059046108735039522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4003688881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2001844340 + 2001844341.

It is an arithmetic number, because the mean of its divisors is an integer number (2001844341).

Almost surely, 2^4003688681 is an apocalyptic number.

It is an amenable number.

4003688681 is a deficient number, since it is larger than the sum of its proper divisors (1).

4003688681 is an equidigital number, since it uses as much as digits as its factorization.

4003688681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 4003688681 is about 63274.7080672839. The cubic root of 4003688681 is about 1587.8888533952. Note that the first 4 decimals are identical.

The spelling of 4003688681 in words is "four billion, three million, six hundred eighty-eight thousand, six hundred eighty-one".