4135581 has 6 divisors (see below), whose sum is σ = 5973630. Its totient is φ = 2757048.

The previous prime is 4135567. The next prime is 4135591. The reversal of 4135581 is 1855314.

It can be written as a sum of positive squares in only one way, i.e., 4040100 + 95481 = 2010^2 + 309^2 .

It is not a de Polignac number, because 4135581 - 2⁹ = 4135069 is a prime.

It is a super-2 number, since 2×4135581² = 34206060415122, which contains 22 as substring.

4135581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4135531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 229746 + ... + 229763.

It is an arithmetic number, because the mean of its divisors is an integer number (995605).

Almost surely, 2^4135581 is an apocalyptic number.

It is an amenable number.

4135581 is a deficient number, since it is larger than the sum of its proper divisors (1838049).

4135581 is a wasteful number, since it uses less digits than its factorization.

4135581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459515 (or 459512 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 4135581 is about 2033.6127950030. The cubic root of 4135581 is about 160.5137263714.

The spelling of 4135581 in words is "four million, one hundred thirty-five thousand, five hundred eighty-one".