5541581 has 4 divisors (see below), whose sum is σ = 5732700. Its totient is φ = 5350464.

The previous prime is 5541577. The next prime is 5541583. The reversal of 5541581 is 1851455.

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 4182025 + 1359556 = 2045^2 + 1166^2 .

It is a cyclic number.

It is not a de Polignac number, because 5541581 - 2² = 5541577 is a prime.

It is a super-2 number, since 2×5541581² = 61418239959122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 191089 = 5541581 / (5 + 5 + 4 + 1 + 5 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5541583) 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, 95516 + ... + 95573.

It is an arithmetic number, because the mean of its divisors is an integer number (1433175).

Almost surely, 2^5541581 is an apocalyptic number.

It is an amenable number.

5541581 is a deficient number, since it is larger than the sum of its proper divisors (191119).

5541581 is a wasteful number, since it uses less digits than its factorization.

5541581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191118.

The product of its digits is 4000, while the sum is 29.

The square root of 5541581 is about 2354.0562864978. The cubic root of 5541581 is about 176.9611350292.

The spelling of 5541581 in words is "five million, five hundred forty-one thousand, five hundred eighty-one".