5538661 has 2 divisors, whose sum is σ = 5538662. Its totient is φ = 5538660.

The previous prime is 5538647. The next prime is 5538667. The reversal of 5538661 is 1668355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5452225 + 86436 = 2335^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 5538661 - 2⁹ = 5538149 is a prime.

5538661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5538667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2769330 + 2769331.

It is an arithmetic number, because the mean of its divisors is an integer number (2769331).

Almost surely, 2^5538661 is an apocalyptic number.

It is an amenable number.

5538661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5538661 is an equidigital number, since it uses as much as digits as its factorization.

5538661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 5538661 is about 2353.4359987049. The cubic root of 5538661 is about 176.9300477938.

The spelling of 5538661 in words is "five million, five hundred thirty-eight thousand, six hundred sixty-one".