4131581 has 4 divisors (see below), whose sum is σ = 4188252. Its totient is φ = 4074912.

The previous prime is 4131577. The next prime is 4131583. The reversal of 4131581 is 1851314.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1666681 + 2464900 = 1291^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 4131581 - 2² = 4131577 is a prime.

It is a super-2 number, since 2×4131581² = 34139923119122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4131583) 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, 28226 + ... + 28371.

It is an arithmetic number, because the mean of its divisors is an integer number (1047063).

Almost surely, 2^4131581 is an apocalyptic number.

It is an amenable number.

4131581 is a deficient number, since it is larger than the sum of its proper divisors (56671).

4131581 is an equidigital number, since it uses as much as digits as its factorization.

4131581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56670.

The product of its digits is 480, while the sum is 23.

The square root of 4131581 is about 2032.6290856917. The cubic root of 4131581 is about 160.4619591978.

Adding to 4131581 its reverse (1851314), we get a palindrome (5982895).

The spelling of 4131581 in words is "four million, one hundred thirty-one thousand, five hundred eighty-one".