7189561 has 2 divisors, whose sum is σ = 7189562. Its totient is φ = 7189560.

The previous prime is 7189549. The next prime is 7189571. The reversal of 7189561 is 1659817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6969600 + 219961 = 2640^2 + 469^2 .

It is an emirp because it is prime and its reverse (1659817) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7189561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7189561.

It is not a weakly prime, because it can be changed into another prime (7189541) 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, 3594780 + 3594781.

It is an arithmetic number, because the mean of its divisors is an integer number (3594781).

Almost surely, 2^7189561 is an apocalyptic number.

It is an amenable number.

7189561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7189561 is an equidigital number, since it uses as much as digits as its factorization.

7189561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

The square root of 7189561 is about 2681.3356746219. The cubic root of 7189561 is about 193.0045100828.

It can be divided in two parts, 7189 and 561, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 7189561 in words is "seven million, one hundred eighty-nine thousand, five hundred sixty-one".