7553921 has 2 divisors, whose sum is σ = 7553922. Its totient is φ = 7553920.

The previous prime is 7553893. The next prime is 7553927. The reversal of 7553921 is 1293557.

7553921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4456321 + 3097600 = 2111^2 + 1760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7553921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7553927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3776960 + 3776961.

It is an arithmetic number, because the mean of its divisors is an integer number (3776961).

Almost surely, 2^7553921 is an apocalyptic number.

It is an amenable number.

7553921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7553921 is an equidigital number, since it uses as much as digits as its factorization.

7553921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9450, while the sum is 32.

The square root of 7553921 is about 2748.4397391975. The cubic root of 7553921 is about 196.2113591820.

The spelling of 7553921 in words is "seven million, five hundred fifty-three thousand, nine hundred twenty-one".