4123681 has 2 divisors, whose sum is σ = 4123682. Its totient is φ = 4123680.

The previous prime is 4123667. The next prime is 4123727. The reversal of 4123681 is 1863214.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3744225 + 379456 = 1935^2 + 616^2 .

It is a cyclic number.

It is not a de Polignac number, because 4123681 - 2¹⁵ = 4090913 is a prime.

It is a super-2 number, since 2×4123681² = 34009489979522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4123621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2061840 + 2061841.

It is an arithmetic number, because the mean of its divisors is an integer number (2061841).

Almost surely, 2^4123681 is an apocalyptic number.

It is an amenable number.

4123681 is a deficient number, since it is larger than the sum of its proper divisors (1).

4123681 is an equidigital number, since it uses as much as digits as its factorization.

4123681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 4123681 is about 2030.6848598441. The cubic root of 4123681 is about 160.3596207875.

Adding to 4123681 its reverse (1863214), we get a palindrome (5986895).

It can be divided in two parts, 41 and 23681, that multiplied together give a triangular number (970921 = T₁₃₉₃).

The spelling of 4123681 in words is "four million, one hundred twenty-three thousand, six hundred eighty-one".