5515921 has 2 divisors, whose sum is σ = 5515922. Its totient is φ = 5515920.

The previous prime is 5515903. The next prime is 5515927. The reversal of 5515921 is 1295155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5107600 + 408321 = 2260^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 5515921 - 2¹¹ = 5513873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5515921.

It is not a weakly prime, because it can be changed into another prime (5515927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2757960 + 2757961.

It is an arithmetic number, because the mean of its divisors is an integer number (2757961).

Almost surely, 2^5515921 is an apocalyptic number.

It is an amenable number.

5515921 is a deficient number, since it is larger than the sum of its proper divisors (1).

5515921 is an equidigital number, since it uses as much as digits as its factorization.

5515921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250, while the sum is 28.

The square root of 5515921 is about 2348.5997956229. The cubic root of 5515921 is about 176.6875759438.

The spelling of 5515921 in words is "five million, five hundred fifteen thousand, nine hundred twenty-one".