7111861 has 2 divisors, whose sum is σ = 7111862. Its totient is φ = 7111860.

The previous prime is 7111843. The next prime is 7111877. The reversal of 7111861 is 1681117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5731236 + 1380625 = 2394^2 + 1175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7111861 is a prime.

7111861 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7111561) 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, 3555930 + 3555931.

It is an arithmetic number, because the mean of its divisors is an integer number (3555931).

Almost surely, 2^7111861 is an apocalyptic number.

It is an amenable number.

7111861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7111861 is an equidigital number, since it uses as much as digits as its factorization.

7111861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 25.

The square root of 7111861 is about 2666.8072671267. The cubic root of 7111861 is about 192.3067020134.

Adding to 7111861 its reverse (1681117), we get a palindrome (8792978).

The spelling of 7111861 in words is "seven million, one hundred eleven thousand, eight hundred sixty-one".