6625921 has 2 divisors, whose sum is σ = 6625922. Its totient is φ = 6625920.

The previous prime is 6625907. The next prime is 6625939. The reversal of 6625921 is 1295266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4145296 + 2480625 = 2036^2 + 1575^2 .

It is a cyclic number.

It is not a de Polignac number, because 6625921 - 2¹¹ = 6623873 is a prime.

6625921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6625321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3312960 + 3312961.

It is an arithmetic number, because the mean of its divisors is an integer number (3312961).

Almost surely, 2^6625921 is an apocalyptic number.

It is an amenable number.

6625921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6625921 is an equidigital number, since it uses as much as digits as its factorization.

6625921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 6625921 is about 2574.0864398850. The cubic root of 6625921 is about 187.8229905510.

The spelling of 6625921 in words is "six million, six hundred twenty-five thousand, nine hundred twenty-one".