5508721 has 2 divisors, whose sum is σ = 5508722. Its totient is φ = 5508720.

The previous prime is 5508703. The next prime is 5508733. The reversal of 5508721 is 1278055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2822400 + 2686321 = 1680^2 + 1639^2 .

It is a cyclic number.

It is not a de Polignac number, because 5508721 - 2¹³ = 5500529 is a prime.

5508721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 5508721.

It is not a weakly prime, because it can be changed into another prime (5508761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2754360 + 2754361.

It is an arithmetic number, because the mean of its divisors is an integer number (2754361).

Almost surely, 2^5508721 is an apocalyptic number.

It is an amenable number.

5508721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5508721 is an equidigital number, since it uses as much as digits as its factorization.

5508721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 5508721 is about 2347.0664668901. The cubic root of 5508721 is about 176.6106649760.

The spelling of 5508721 in words is "five million, five hundred eight thousand, seven hundred twenty-one".