4123561 has 4 divisors (see below), whose sum is σ = 4440772. Its totient is φ = 3806352.

The previous prime is 4123547. The next prime is 4123583. The reversal of 4123561 is 1653214.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1653214 = 2 ⋅826607.

It can be written as a sum of positive squares in 2 ways, for example, as 1547536 + 2576025 = 1244^2 + 1605^2 .

It is a cyclic number.

It is not a de Polignac number, because 4123561 - 2⁵ = 4123529 is a prime.

It is a Duffinian number.

4123561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4123531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158586 + ... + 158611.

It is an arithmetic number, because the mean of its divisors is an integer number (1110193).

Almost surely, 2^4123561 is an apocalyptic number.

It is an amenable number.

4123561 is a deficient number, since it is larger than the sum of its proper divisors (317211).

4123561 is a wasteful number, since it uses less digits than its factorization.

4123561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317210.

The product of its digits is 720, while the sum is 22.

The square root of 4123561 is about 2030.6553129470. The cubic root of 4123561 is about 160.3580652726.

Adding to 4123561 its reverse (1653214), we get a palindrome (5776775).

The spelling of 4123561 in words is "four million, one hundred twenty-three thousand, five hundred sixty-one".