7115561 has 2 divisors, whose sum is σ = 7115562. Its totient is φ = 7115560.

The previous prime is 7115539. The next prime is 7115567. The reversal of 7115561 is 1655117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4494400 + 2621161 = 2120^2 + 1619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7115561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7115561.

It is not a weakly prime, because it can be changed into another prime (7115567) 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, 3557780 + 3557781.

It is an arithmetic number, because the mean of its divisors is an integer number (3557781).

Almost surely, 2^7115561 is an apocalyptic number.

It is an amenable number.

7115561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7115561 is an equidigital number, since it uses as much as digits as its factorization.

7115561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1050, while the sum is 26.

The square root of 7115561 is about 2667.5008903466. The cubic root of 7115561 is about 192.3400459084.

The spelling of 7115561 in words is "seven million, one hundred fifteen thousand, five hundred sixty-one".