9125021 has 2 divisors, whose sum is σ = 9125022. Its totient is φ = 9125020.

The previous prime is 9125009. The next prime is 9125023. The reversal of 9125021 is 1205219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6100900 + 3024121 = 2470^2 + 1739^2 .

It is an emirp because it is prime and its reverse (1205219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9125021 - 2¹⁸ = 8862877 is a prime.

Together with 9125023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 9124984 and 9125002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9125023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4562510 + 4562511.

It is an arithmetic number, because the mean of its divisors is an integer number (4562511).

Almost surely, 2^9125021 is an apocalyptic number.

It is an amenable number.

9125021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9125021 is an equidigital number, since it uses as much as digits as its factorization.

9125021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 9125021 is about 3020.7649693414. The cubic root of 9125021 is about 208.9671201224.

The spelling of 9125021 in words is "nine million, one hundred twenty-five thousand, twenty-one".