4571681 has 2 divisors, whose sum is σ = 4571682. Its totient is φ = 4571680.

The previous prime is 4571629. The next prime is 4571731. The reversal of 4571681 is 1861754.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4558225 + 13456 = 2135^2 + 116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4571681 is a prime.

It is a super-2 number, since 2×4571681² = 41800534331522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4571081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2285840 + 2285841.

It is an arithmetic number, because the mean of its divisors is an integer number (2285841).

Almost surely, 2^4571681 is an apocalyptic number.

It is an amenable number.

4571681 is a deficient number, since it is larger than the sum of its proper divisors (1).

4571681 is an equidigital number, since it uses as much as digits as its factorization.

4571681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 4571681 is about 2138.1489658113. The cubic root of 4571681 is about 165.9683614159.

The spelling of 4571681 in words is "four million, five hundred seventy-one thousand, six hundred eighty-one".