5540661 has 24 divisors (see below), whose sum is σ = 9444864. Its totient is φ = 3062880.

The previous prime is 5540659. The next prime is 5540683. The reversal of 5540661 is 1660455.

5540661 = 39² + 40² + ... + 255².

It is a happy number.

It is not a de Polignac number, because 5540661 - 2¹ = 5540659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5540611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 535 + ... + 3371.

It is an arithmetic number, because the mean of its divisors is an integer number (393536).

Almost surely, 2^5540661 is an apocalyptic number.

It is an amenable number.

5540661 is a deficient number, since it is larger than the sum of its proper divisors (3904203).

5540661 is a wasteful number, since it uses less digits than its factorization.

5540661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2881 (or 2878 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 5540661 is about 2353.8608709947. The cubic root of 5540661 is about 176.9513415994.

The spelling of 5540661 in words is "five million, five hundred forty thousand, six hundred sixty-one".