5540081 has 4 divisors (see below), whose sum is σ = 5630964. Its totient is φ = 5449200.

The previous prime is 5540069. The next prime is 5540083. The reversal of 5540081 is 1800455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1800455 = 5 ⋅360091.

It can be written as a sum of positive squares in 2 ways, for example, as 1540081 + 4000000 = 1241^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 5540081 - 2¹⁰ = 5539057 is a prime.

It is a super-2 number, since 2×5540081² = 61384994973122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5540083) 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, 45350 + ... + 45471.

It is an arithmetic number, because the mean of its divisors is an integer number (1407741).

Almost surely, 2^5540081 is an apocalyptic number.

It is an amenable number.

5540081 is a deficient number, since it is larger than the sum of its proper divisors (90883).

5540081 is an equidigital number, since it uses as much as digits as its factorization.

5540081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90882.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 5540081 is about 2353.7376659263. The cubic root of 5540081 is about 176.9451669234.

The spelling of 5540081 in words is "five million, five hundred forty thousand, eighty-one".