4131565 has 4 divisors (see below), whose sum is σ = 4957884. Its totient is φ = 3305248.

The previous prime is 4131539. The next prime is 4131577. The reversal of 4131565 is 5651314.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5651314 = 2 ⋅2825657.

It can be written as a sum of positive squares in 2 ways, for example, as 3143529 + 988036 = 1773^2 + 994^2 .

It is a cyclic number.

It is not a de Polignac number, because 4131565 - 2¹⁵ = 4098797 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413152 + ... + 413161.

It is an arithmetic number, because the mean of its divisors is an integer number (1239471).

Almost surely, 2^4131565 is an apocalyptic number.

It is an amenable number.

4131565 is a deficient number, since it is larger than the sum of its proper divisors (826319).

4131565 is an equidigital number, since it uses as much as digits as its factorization.

4131565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826318.

The product of its digits is 1800, while the sum is 25.

The square root of 4131565 is about 2032.6251498985. The cubic root of 4131565 is about 160.4617520620.

Adding to 4131565 its reverse (5651314), we get a palindrome (9782879).

The spelling of 4131565 in words is "four million, one hundred thirty-one thousand, five hundred sixty-five".