5578921 has 2 divisors, whose sum is σ = 5578922. Its totient is φ = 5578920.

The previous prime is 5578871. The next prime is 5578931. The reversal of 5578921 is 1298755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4995225 + 583696 = 2235^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 5578921 - 2¹³ = 5570729 is a prime.

It is a super-2 number, since 2×5578921² = 62248719048482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5578931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2789460 + 2789461.

It is an arithmetic number, because the mean of its divisors is an integer number (2789461).

Almost surely, 2^5578921 is an apocalyptic number.

It is an amenable number.

5578921 is a deficient number, since it is larger than the sum of its proper divisors (1).

5578921 is an equidigital number, since it uses as much as digits as its factorization.

5578921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 37.

The square root of 5578921 is about 2361.9739625999. The cubic root of 5578921 is about 177.3577091479.

The spelling of 5578921 in words is "five million, five hundred seventy-eight thousand, nine hundred twenty-one".