7128361 has 2 divisors, whose sum is σ = 7128362. Its totient is φ = 7128360.

The previous prime is 7128353. The next prime is 7128391. The reversal of 7128361 is 1638217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4756761 + 2371600 = 2181^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 7128361 - 2³ = 7128353 is a prime.

It is not a weakly prime, because it can be changed into another prime (7128391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3564180 + 3564181.

It is an arithmetic number, because the mean of its divisors is an integer number (3564181).

Almost surely, 2^7128361 is an apocalyptic number.

It is an amenable number.

7128361 is a deficient number, since it is larger than the sum of its proper divisors (1).

7128361 is an equidigital number, since it uses as much as digits as its factorization.

7128361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 7128361 is about 2669.8990617624. The cubic root of 7128361 is about 192.4553086784.

The spelling of 7128361 in words is "seven million, one hundred twenty-eight thousand, three hundred sixty-one".