8402561 has 2 divisors, whose sum is σ = 8402562. Its totient is φ = 8402560.

The previous prime is 8402543. The next prime is 8402593. The reversal of 8402561 is 1652048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8300161 + 102400 = 2881^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 8402561 - 2⁶ = 8402497 is a prime.

It is a super-3 number, since 3×8402561³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8402561.

It is not a weakly prime, because it can be changed into another prime (8402531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4201280 + 4201281.

It is an arithmetic number, because the mean of its divisors is an integer number (4201281).

Almost surely, 2^8402561 is an apocalyptic number.

It is an amenable number.

8402561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8402561 is an equidigital number, since it uses as much as digits as its factorization.

8402561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 8402561 is about 2898.7171300422. The cubic root of 8402561 is about 203.2999279231.

The spelling of 8402561 in words is "eight million, four hundred two thousand, five hundred sixty-one".