7975021 has 2 divisors, whose sum is σ = 7975022. Its totient is φ = 7975020.

The previous prime is 7975013. The next prime is 7975027. The reversal of 7975021 is 1205797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 1240996 = 2595^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 7975021 - 2³ = 7975013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7975027) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3987510 + 3987511.

It is an arithmetic number, because the mean of its divisors is an integer number (3987511).

Almost surely, 2^7975021 is an apocalyptic number.

It is an amenable number.

7975021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7975021 is an equidigital number, since it uses as much as digits as its factorization.

7975021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 7975021 is about 2824.0079674109. The cubic root of 7975021 is about 199.7916246406.

The spelling of 7975021 in words is "seven million, nine hundred seventy-five thousand, twenty-one".